05 638
DIAGNOSTICS  COMBINATION METER
COMBINATION METER
057KA 02
HOW TO PROCEED WITH TROUBLESHOOTING
1 Vehicle Brought to Workshop
2 Customer Problem Analysis (See page 05 639)
3 Problem Symptom Confirmation (See page 05 647)
4 Circuit Inspection (See page 05 648  05 668)
5 Repair or Replace
6 Confirmation Test
7 End
2004 COROLLA (RM1037U)
Author : Date : 803
05 639
DIAGNOSTICS  COMBINATION METER
057KB 02
CUSTOMER PROBLEM ANALYSIS CHECK
COMBINATION METER Check Sheet
Inspector s name:
Registration No.
Customer s Name
Registration Year
Frame No.
Date of Vehicle
Km
Odometer Reading
Brought in
Mile
Date Problem First Occurred
How Often Problem Occurs
Continuous Intermittent ( Times a day)
Fine Cloudy Snowy Other
Weather
Temperature Approx.
Malfunction in speedometer
Malfunction in tachometer
Malfunction in fuel receiver gauge
Malfunction in water temperature receiver
gauge
Key unlock warning buzzer does not sound
Light auto turn off warning buzzer does not sound
Malfunction in driver s seat belt warning buzzer
All buzzers do not sound
I30045
2004 COROLLA (RM1037U)
Author : Date : 804
Gauge
Problem Symptom
Buzzer
05 640
DIAGNOSTICS  COMBINATION METER
057KC 02
LOCATION
Combination Meter
Brake Fluid Level Warning Switch
Fuel Sender Gauge
Rear Door Courtesy
Switch
Front Door Courtesy Switch
Engine Room J/B, R/B
D DOME Fuse
I32723
2004 COROLLA (RM1037U)
Author : Date : 805
05 641
DIAGNOSTICS  COMBINATION METER
ECM
Passenger Seat Belt Warning
Light Assembly
Key Unlock Warning
Switch
RH J/B
Transmission Control Switch
Center J/B
Parking Brake Switch
Instrument Panel J/B
D GAUGE Fuse
Front Seat Belt Inner Belt
D AM1 Fuse
(Passenger s)
Separate Type Front Seat
Cushion Pad
Front Seat Belt Inner
Belt (Driver s)
I32724
2004 COROLLA (RM1037U)
Author : Date : 806
05 642
DIAGNOSTICS  COMBINATION METER
I30037
2004 COROLLA (RM1037U)
Author : Date : 807
05 643
DIAGNOSTICS  COMBINATION METER
18
28
2
BEAM
13
17
DOOR
20
14
I/F I/F
6
TURN L
24
TURN R
I/F
8 25
I/F
30
5
9
I/F
4
26
CPU
I/F
19
LCD
OUTSIDE TEMP
D BELT
LCD
1
I/F ODO/TRIP
7
SPEED
22
FUEL WRN
TACHO
I/F
11
FUEL
I/F
12
TEMP
I/F
16
BUZZER
10
CHG
31 32
CHK E/G
33
O/D OFF
3
36
BRAKE
35
WASHER LEVEL (Canada)
34
37
ABS
OIL P
21
39
AIR BAG
CRUISE
23
I32739
2004 COROLLA (RM1037U)
Author : Date : 808
05 644
DIAGNOSTICS  COMBINATION METER
Terminal No. Wire harness side
1
Ground (Signal Ground)
C9
2 Ground (Power Ground)
3 ECM
4 GAUGE Fuse
5
DOME Fuse
6
Front Passenger Seat Belt Warning Indicator
Fuel sender gauge
7
8 ECM
Skid Control ECU (w/ ABS), Vehicle Speed Control Sensor (w/o ABS)
9
10 Cruise Control ECU, ECM
11 Buckle Switch RH
Buckle Switch LH
12
13
Ground
14
HEAD RH UPR Fuse
15 
16 Unlock Warning Switch
17
Driver Side Courtesy Switch
18 Tail Relay (USA), Combination Switch (Canada)
19 ECM
20 Except Driver Side Courtesy Switch
21 Engine Oil Pressure Switch
22
Fuel sender gauge
23 Cruise Control ECU
Turn Signal Flasher
24
25 Turn Signal Flasher
Ambient Temperature Sensor
26
Rheostat
28
30 Ambient Temperature Sensor
31
Alternator
32 GAUGE Fuse
ECM
33
Washer Level Sensor (Canada)
34
Brake Fluid Level Warning Switch
35
36 Skid Control ECU with Actuator (w/ ABS), Ground (w/o ABS)
37 Skid Control ECU with Actuator (w/ ABS), Ground (w/o ABS)
38 
Airbag Sensor Assembly
39
40 
2004 COROLLA (RM1037U)
Author : Date : 809
05 645
DIAGNOSTICS  COMBINATION METER
057KD 04
TERMINALS OF ECU
C9
20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21
I32850
Terminals No. (Symbols) Wiring Color Condition STD Voltage (V)
1 "! Body ground
(SIGNAL EARTH "! Body BR Constant Continuity
ground)
2 "! Body ground
(POWER EARTH "! Body W B Constant Continuity
ground)
3 "! Body ground
LG O/D off indicator light ON OFF Below 1V 10  14 V
(O/D "! Body ground)
4 "! Body ground
R W Ignition switch OFF or ACC ON Below 1V 10  14 V
(IG1+ "! Body ground)
5 "! Body ground
L W Constant 10  14 V
(+B "! Body ground)
6 "! Body ground
L Passenger seat belt warning ON OFF Below 1V "! 10  14 V
(P BELT OUT "! Body ground)
7 "! Body ground
Y Fuel level is full empty Below 1V 4  7 V
(FUEL "! Body ground)
8 "! Body ground
Y R Ignition switch ON Pulse generation
(TEMP "! Body ground)
9 "! Body ground
W G Ignition switch ON and slowly turn drive wheel Below 1 V "! 10  14 V
(SP IN "! Body ground)
10 "! Body ground
V W Ignition switch ON and slowly turn drive wheel Below 1 V "! 10  14 V
(4P OUT "! Body ground)
Ignition switch ON and passenger seat belt buckle switch ON
Below 1 V
(Belt unfastened)
11 "! Body ground
11 "! Body ground
L W
L W
(P BELT SW "! Body ground)
Ignition switch ON and passenger seat belt buckle switch OFF
10  14 V
(Belt fastened)
Ignition switch ON and driver seat belt buckle switch ON (Belt
Below 1 V
unfastened)
12 "! Body ground
12 "! Body ground
G Y
G Y
(D BELT SW "! Body ground)
Ignition switch ON and driver seat belt buckle switch OFF (Belt
10  14 V
fastened)
13 "! Body ground
W B Hi beam indicator light ON OFF Below 1V 10  14 V
(BEAM "! Body ground)
14 "! Body ground
R Constant 10  14 V
(BEAM+ "! Body ground)
2004 COROLLA (RM1037U)
Author : Date : 810
05 646
DIAGNOSTICS  COMBINATION METER
Ignition key inserted Below 1 V
16 "! Body ground
16 "! Body ground
L B
L B
(KEY SW "! Body ground)
No ignition key inserted 10  14 V
17 "! Body ground
R W Driver door opened closed Below 1V 10  14 V
(D DOOR "! Body ground)
18 "! Body ground
G Tail light switch OFF ON Below 1V 10  14 V
(ILL+ "! Body ground)
19 "! Body ground
B Engine running Pulse generation
(TACHO "! Body ground)
20 "! Body ground
(EXCEPT D DOOR "! Body R Passenger door opened closed Below 1V 10  14 V
ground)
21 "! Body ground
W Oil pressure warning light ON OFF Below 1V 10  14 V
(OIL P "! Body ground)
22 "! Body ground
BR Constant Continuity
(FUEL EARTH "! Body ground)
23 "! Body ground
G R Ignition switch ON and cruise indicator light ON OFF Below 1V 10  14 V
(CRUISE "! Body ground)
24 "! Body ground
G B Left turn indicator light OFF ON Below 1V 10  14 V
(TURN L "! Body ground)
25 "! Body ground
G Y Right turn indicator light OFF ON Below 1V 10  14 V
(TURN R "! Body ground)
26 "! 30
(OUT SIDE TEMP+ "! OUT B  B L Outside temperature at +25_C (77_F) 1.6  1.8K&!
SIDE TEMP )
28 "! Body ground
W R Ignition switch On and light control rheostat volume minimum No voltage
(ILL "! Body ground)
31 "! Body ground
Y Discharge indicator light OFF ON Below 1V 10  14 V
(CHG "! Body ground)
32 "! Body ground
B O Ignition switch OFF ON Below 1V 10  14 V
(IG2 "! Body ground)
33 "! Body ground
R Y Malfunction indicator light ON OFF Below 1V 10  14 V
(CHK ENG "! Body ground)
34 "! Body ground
(WASHER LEVEL "! Body * L W Washer level indicator light ON OFF Below 1V 10  14 V
ground)
35 "! Body ground
(BRAKE LEVEL SW "! Body R W Ignition switch ON and brake fluid level warning light ON OFF Below 1V 10  14 V
ground)
36 "! Body ground
R Brake warning light ON OFF 4  8 V Below 1V
(EBD "! Body ground)
37 "! Body ground
W R ABS warning light ON OFF 4  8 V Below 1V
(ABS "! Body ground)
39 "! Body ground
B Y A/B warning light ON OFF Below 1V 6  11 V
(A/B "! Body ground)
*: Canada
2004 COROLLA (RM1037U)
Author : Date : 811
05 647
DIAGNOSTICS  COMBINATION METER
057KE 02
PROBLEM SYMPTOMS TABLE
Symptom Suspect Area See page
3. Fuse
Entire combination meter does not operate. 4. Wire harness and connector 05 648
5. Combination meter assembly
1. Brake system
Malfunction in speed meter. 2. Wire harness and connector 05 650
3. Combination meter assembly
1. ECM
Malfunction in tacho meter. 2. Wire harness and connector 05 653
3. Combination meter assembly
1. Fuel sender gauge
Malfunction in fuel receiver gauge. 2. Wire harness and connector 05 655
3. Combination meter assembly
1. ECM
Malfunction in water temperature gauge. 2. Wire harness and connector 05 657
3. Combination meter assembly
1. Front door courtesy switch
 Key unlock warning bozzer or  Light auto turn off warning buzz- 2. Key unlock warning switch
05 659
er does not operate. 3. Wire harness and connector
4. Combination meter assembly
1. Driver seat belt buckle switch
Driver seat belt warning buzzer does not sound. 2. Wire harness and connector 05 663
3. Combination meter assembly
1. Front seat inner belt assembly
2. Separate type front seat cushion pad
Seat belt warning lamp for front passenger seat does not flash. 05 663
3. Combination meter assembly
4. Passenger seat belt warning light assembly
1. Fuse
Malfunction in clock. 2. Wire harness and connector 05 666
3. Clock assembly
1. Fuse
The ambient temperature does not display. 2. Wire harness and connector 05 668
3. Ambient temperature sensor
2004 COROLLA (RM1037U)
Author : Date : 812
05 648
DIAGNOSTICS  COMBINATION METER
057T2 02
ENTIRE COMBINATION METER DOES NOT OPERATE
WIRING DIAGRAM
Combination Meter
Instrument Panel J/B
RH J/B
IG1 Relay
GAUGE
1 22 16
2 4
IA C9
IG 3B IG1
3B
W 5 3 R W R W
2
IF
B Y
1 2 Center J/B
7 19
4 20
5
IC C9
IL 4C
4C +B
L W L W L W
21 18 2
C9 POWER
4B 4B
W B
EARTH
4
IF
W B
AM1
12
1
IF
IB
W
I10 Ignition Switch
W B
1
2
IG1 AM1
W
Engine Room J/B, R/B
1
1C
1 ALT
A
2 1
1D
J6
A
J/C
DOME
1
FL MAIN
2 1
1 1A
B
Battery
IE
I32767
INSPECTION PROCEDERE
1 CHECK FUSE
(a) Check that continuity exists of DOME fuse.
(b) Check that continuity exists of GAUGE fuse.
(c) Check that continuity exists of AM1 fuse.
NG REPLACE FUSE
OK
2004 COROLLA (RM1037U)
Author : Date : 813
05 649
DIAGNOSTICS  COMBINATION METER
2 INSPECT COMBINATION METER ASSY
(a) Check continuity.
(1) Disconnect the  C9 connector from combination
meter assy.
(2) Check continuity between terminal C9 2 of com-
bination meter assy connector and body ground.
OK: Continuity exists
POWER
EARTH
I32115
(b) Check voltage.
(1) Disconnect the  C9 connector from combination
meter assy.
(2) Measure voltage between terminal C9 5 of com-
bination meter assy connector and body ground.
Voltage: 10  14 V
(3) Turn the ignition switch to ON.
(4) Measure voltage between terminal C9 4 of com-
IG1
+B
bination meter assy connector and body ground.
I32115
Voltage: 10  14 V
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
CHECK AND REPLACE COMBINATION METER ASSY
2004 COROLLA (RM1037U)
Author : Date : 814
05 650
DIAGNOSTICS  COMBINATION METER
057KG 04
MALFUNCTION IN SPEEDOMETER
WIRING DIAGRAM
Vehicle Speed Sensor Combination Meter
9
3 4
(*1) (*1)
SP1 V1 II2 C9 SP IN
W G W G
W G
Skid Control ECU
with Actuator
17
14
(*2) (*2)
SP1 S1 IA6
W G W G
*1: w/o ABS
*2: w/ ABS
I32764
INSPECTION PROCEDURE
1 CHECK COMBINATION METER ASSY
(a) Remove the combination meter assy with connector still
connected.
(b) Check voltage.
(1) Jack up either of the front wheels.
(2) Shift the shift lever to neutral.
(3) Turn the ignition switch to ON.
(4) Measure the voltage between terminals C9 9 of
SP IN
combination meter assy and body ground when
front wheel is turning slowly.
I30040
Standard voltage:
Voltage is generated intermittently.
10  14V
0
Turn the wheel
2004 COROLLA (RM1037U)
Author : Date : 815
05 651
DIAGNOSTICS  COMBINATION METER
Result:
A B C
OK NG (w/ ABS) NG (w/o ABS)
B Go to step 2
C Go to step 3
A
CHECK AND REPLACE COMBINATION METER ASSY
2 CHECK OBD II SCAN TOOL OR HAND HELD TESTER
(a) Check output value of skid control ECU.
(1) Connect the hand held tester to DLC3.
(2) Turn the ignition switch to ON and push the hand held tester main switch ON.
(3) Select the DATA LIST mode on the hand held tester.
(4) Check that there is no difference between the speed value output from the speed sensor dis-
played by the hand held tester and the speed value displayed by the speedometer when driving
the vehicle.
OK: There is almost no difference from the displayed speed value.
NG GO TO BRAKE SYSTEM
OK
REPAIR OR REPLACE HARNESS OR CONNECTOR
2004 COROLLA (RM1037U)
Author : Date : 816
05 652
DIAGNOSTICS  COMBINATION METER
3 INSPECT SPEEDOMETER SENSOR
(a) Check voltage.
(1) Shift the shift lever to neutral.
(2) Jack up either of the front wheel.
(3) Turn the ignition switch to ON.
(4) Measure voltage between terminals 3 and 2 of
speed sensor when the front wheel is turning slowly.
Standard voltage:
Voltage is generated intermittently.
I31248
10  14V
0
Turn the wheel
NG CHECK AND REPLACE SPEEDOMETER
SENSOR
OK
REPAIR OR REPLACE HARNESS OR CONNECTOR
2004 COROLLA (RM1037U)
Author : Date : 817
05 653
DIAGNOSTICS  COMBINATION METER
057KH 02
MALFUNCTION IN TACHOMETER
WIRING DIAGRAM
ECM
Combination Meter
5 19
TACH E6 C9 TACHO
B
I32725
INSPECTION PROCEDURE
1 READ VALUE OF HAND HELD TESTER
(a) Check output value of ECM.
(1) Connect the hand held tester to DLC3.
(2) Turn the ignition switch to ON and push the hand held tester main switch ON.
(3) Select the DATA LIST mode on the hand held tester.
Mesurement Item / Range
Item Condition Specified Condition
(Display)
Engine Speed /
ENGINE SPD With Engine Idling 650  750rpm
Min.: 0 rpm, Max.: 16,383rpm
NG GO TO ENGINE CONTROL SYSTEM
OK
2004 COROLLA (RM1037U)
Author : Date : 818
05 654
DIAGNOSTICS  COMBINATION METER
2 INSPECT COMBINATION METER ASSY
(REFERENCE) INSPECTION USING OSCILLOSCOPE
(a) Check the input signal waveform.
(1) Remove the combination meter assy with connec-
tors still connected.
(2) Connect the oscilloscope to the terminals C9 19 of
combination meter assy and body ground.
(3) Start engine.
TACHO
(4) Check the signal waveform.
I30040 Item Contents
Tool setting 10 V/ DIV, 20 ms/ DV
Vehicle condition Engine idle speed
E50835
OK CHECK AND REPLACE COMBINATION METER
ASSY
NG
3 CHECK HARNESS AND CONNECTOR(BETWEEN ECM AND COMBINATION
METER ASSY)
(a) Remove the combination meter.
(b) Check the continuity between terminals 5 (TACH) of ECM and C9 19 of combination meter connector.
Standard: There is continuity.
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
CHECK AND REPLACE ECM
2004 COROLLA (RM1037U)
Author : Date : 819
05 655
DIAGNOSTICS  COMBINATION METER
057KJ 02
MALFUNCTION IN FUEL RECEIVER GAUGE
WIRING DIAGRAM
F10
Combination Meter
Fuel Pump
Fuel Sender
22
13
BR BR
C9 FUEL
ID2
2 3
EARTH
7
5
Y Y
C9 FUEL
ID2
I32726
INSPECTION PROCEDERE
1 INSPECT FUEL SENDER GAGE ASSY
(a) Disconnect the connector fuel sender gauge.
(b) Check the float position between E and F and measure
the resistance between terminals 2 and 3 of the connec-
tor. Check that the resistance value changes continuous-
ly.
3 2 1 Standard:
Float level Float position mm (in.) Resistance (&! )
F 64.5 (2.53) " 3 (0.12) 15.0 " 1
1/2 11.6 (0.45) " 3 (0.12) 54.7 " 3
e 3 1 B E51362
E 52.7 (2.07) " 3 (0.12) 107.0 " 1
F
12mm
1/2
(0 in.)
NG REPLACE FUEL SENDER GAGE ASSY
E
I32082
OK
2004 COROLLA (RM1037U)
Author : Date : 820
05 656
DIAGNOSTICS  COMBINATION METER
2 CHECK HARNESS AND CONNECTOR(BETWEEN FUEL SENDER GAGE AND
COMBINATION METER ASSY)
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
CHECK AND REPLACE COMBINATION METER ASSY
2004 COROLLA (RM1037U)
Author : Date : 821
05 657
DIAGNOSTICS  COMBINATION METER
057KI 02
MALFUNCTION IN WATER TEMPERATURE RECEIVER GAUGE
WIRING DIAGRAM
ECM Combination Meter
14 8
TEMP
THWO E5 C9
Y R
I32725
INSPECTION PROCEDURE
1 READ VALUE OF HAND HELD TESTER
(a) Check output value of ECM.
(1) Connect the hand held tester to DLC3.
(2) Turn the ignition switch to ON and push the hand held tester main switch ON.
(3) Select the DATA LIST mode on the hand held tester.
Mesurement Item /Range
Item Condition Specified Condition
(Display)
Coolant Temperature /
COOLANT TEMP After Warming Up 80  95_C (176  203_F)
Min.:  40_C, Max.: 140_C
NG GO TO ENGINE CONTROL SYSTEM
OK
2004 COROLLA (RM1037U)
Author : Date : 822
05 658
DIAGNOSTICS  COMBINATION METER
2 INSPECT COMBINATION METER ASSY
(REFERENCE) INSPECTION USING OSCILLOSCOPE
(a) Check the input signal waveform.
(1) Remove the combination meter with connectors still
connected.
(2) Connect the oscilloscope to the terminals C9 8 of
combination meter assy and body ground.
(3) Start engine.
TEMP
(4) Check the signal waveform.
I32114 Item Contents
Tool setting 5 V/ DIV, 100 ms/ DV
Vehicle condition Ignition switch ON
I32122
OK CHECK AND REPLACE COMBINATION METER
ASSY
NG
3 CHECK HARNESS AND CONNECTOR(BETWEEN ECM AND COMBINATION
METER ASSY)
(a) Remove the combination meter.
(b) Check the continuity between terminals 14 (THWO) of ECM and C9 8 of combination meter connector.
Standard: There is continuity.
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
CHECK AND REPLACE ECM
2004 COROLLA (RM1037U)
Author : Date : 823
05 659
DIAGNOSTICS  COMBINATION METER
057T3 02
WARNING BUZZER DOES NOT SOUND (KEY REMINDER
WARNING, LIGHT REMINDER WARNING)
WIRING DIAGRAM
Combination Meter
RH J/B
15 14
U1
4A 4A
Unlock Warning SW
L B(*1) L B(*1)
16
C9
KEY SW
W B 1 2
L B(*2)
Instrument Panel J/B
17
Integration Relay 3
IL
C9 D DOOR
DCTY
5
R W
1
ID
R W
A
J6
J/C
1
D4
Door Courtesy SW
IE (Driver s Side)
*1: w/ Door Lock Control
*2: w/o Door Lock Control
I32381
INSPECTION PROCEDERE
1 CHECK BUZZER
(a) Check that all of the warning buzzers sound.
A B
Some buzzers sound No buzzer sounds
B CHECK AND REPLACE COMBINATION METER
ASSY
A
2004 COROLLA (RM1037U)
Author : Date : 824
05 660
DIAGNOSTICS  COMBINATION METER
2 INSPECT FRONT DOOR COURTESY LAMP SWITCH ASSY(See Page 65 7)
NG REPLACE FRONT DOOR COURTESY LAMP
SWITCH ASSY
OK
3 INSPECT UN LOCK WARNING SWITCH ASSY(See Page 05 682)
NG REPLACE UN LOCK WARNING SWITCH ASSY
OK
4 CHECK HARNESS AND CONNECTOR(BETWEEN UN LOCK WARNING SWITCH
AND COMBINATION METER ASSY)
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
5 CHECK HARNESS AND CONNECTOR(BETWEEN COURTESY LAMP SWITCH AND
COMBINATION METER ASSY)
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
CHECK AND REPLACE COMBINATION METER ASSY
2004 COROLLA (RM1037U)
Author : Date : 825
05 661
DIAGNOSTICS  COMBINATION METER
057T4 02
SEAT BELT WARNING LAMP FOR DRIVER S SEAT DOES NOT
OPERATE
WIRING DIAGRAM
B6
Buckle SW LH
Airbag Sensor Assy
Seat Position Sensor
Combination Meter
11
2
A12
LBE+ LBE+
G
1 12
3
3
4 L IG1 D BELT SW
C9
LSP+ A12 LSP+
G Y G Y
G W
4
1
5
LSP A12 LBE
LSP
R B W B
RH J/B
J7
J/C
11 15
2
A
3A 3A IG1
W B W B
IG
I32384
INSPECTION PROCEDURE
1 CHECK COMBINATION METER ASSY
(a) Ground terminal C9 12 on the combination meter side.
(b) Check that the warning lightlights up.
OK: Warning light lights up.
D BELT SW
NG CHECK AND REPLACE COMBINATION METER
I30040 ASSY
OK
2004 COROLLA (RM1037U)
Author : Date : 826
05 662
DIAGNOSTICS  COMBINATION METER
2 INSPECT FRONT SEAT INNER BELT ASSY LH
(a) Disconnect the front seat inner belt assy.
(b) Check continuity front seat inner belt assy.
Belt condition Terminal Specified condition
Belt unfastend 1  2 Continuity
Belt fastend 1  2 No continuity
I30985
NG REPLACE FRONT SEAT INNER BELT ASSY LH
OK
REPAIR OR REPLACE HARNESS OR CONNECTOR
2004 COROLLA (RM1037U)
Author : Date : 827
05 663
DIAGNOSTICS  COMBINATION METER
057KM 04
SEAT BELT WARNING LAMP FOR FRONT PASSENGER S SEAT
DOES NOT FLASH
WIRING DIAGRAM
F7
Front Passenger Seat
Combination Meter
Belt Warning Light
RH J/B
22 11 6
1
3
to GAUGE Fuse 3B 3B C9
P BELT OUT
B LAPL
R W L
R W
Buckle SW RH
Airbag Sensor Assy Occupant Detection Sensor
8 11
3
2 3
RBE+
A14 BMR ODS IG1 C9 P BELT SW
B B
L W L W
4
WS+
B
1
E
W B
J7
RH J/B
J/C
4 14 11
A
IG1 3A 3A
W B W B
IG
I32383
2004 COROLLA (RM1037U)
Author : Date : 828
05 664
DIAGNOSTICS  COMBINATION METER
INSPECTION PROCEDURE
1 INSPECT COMBINATION METER ASSY
(a) Ground terminal C9 11 on the combination meter side.
(b) Check that the warning lightlights up.
OK: Warning light lights up.
OK Go to step 3
P BELT SW
I30040
NG
2 INSPECT PASSENGER SEAT BELT WARNING LAMP ASSY
(a) Ground terminal C9 6 on the combination meter side.
(b) Check that the warning lightlights up.
OK: Warning light lights up.
P BELT OUT
NG CHECK AND REPLACE PASSENGER SEAT
I30040
BELT WARNING LAMP ASSY
OK
CHECK AND REPLACE COMBINATION METER ASSY
3 INSPECT FRONT SEAT INNER BELT ASSY RH
(a) Check continuity.
(1) Disconnect the front seat inner belt assy.
(2) Check the continuity in between terminals 1 and 2
of front seat inner belt assy RH.
OK:
Condition Continuity
Seat belt is fastened Continuity
Seat belt is unfastened No continuity
I32727
NG CHECK AND REPLACE FRONT SEAT INNER
BELT ASSY RH
OK
2004 COROLLA (RM1037U)
Author : Date : 829
05 665
DIAGNOSTICS  COMBINATION METER
4 INSPECT SEPARATE SEAT TYPE FRONT SEAT CUSHION PAD
(a) Disconnect the separate type front seat cushion pad.
Connector
(b) Check continuity separate type front seat cushion pad.
Sear condition Terminal Specified condition
Press
Released 1  2 No continuity
Pressed 1  2 Continuity
Released
I30048
NG CHECK AND REPLACE SEPARATE SEAT TYPE
FRONT SEAT CUSHION PAD
OK
REPAIR OR REPLACE HARNESS AND CONNECTOR
2004 COROLLA (RM1037U)
Author : Date : 830
05 666
DIAGNOSTICS  COMBINATION METER
057T5 02
MALFUNCTION IN CLOCK
WIRING DIAGRAM
Clock
3
TAIL Relay (USA)
G
Combination SW (Canada)
RH J/B
11 18
2
3A 3A
W B W B
10 5
4
3A
3A
GR
1
GR
Instrument Panel J/B
CIG
8 6
IF IF
I10 Ignition SW
AM1
1 12
1 3
IB IF
W W L R
AM1 ACC
Center J/B
7 4 20 16
IC IL 4C 4C
L W
L W
L W
Engine Room J/B, R/B
A
J7
DOME
J/C
2 1
1
1 ALT 1
FL MAIN
2 1
1C 1A
B
Battery
IG
I32382
INSPECTION PROCEDURE
1 INSPECT FUSE
(a) Check the continuity in CIG fuse.
(b) Check the continuity in DOME fuse.
NG REPLACE FUSE
OK
2004 COROLLA (RM1037U)
Author : Date : 831
05 667
DIAGNOSTICS  COMBINATION METER
2 INSPECT HARNESS OR CONNECTOR
(a) Check voltage.
(1) Remove the clock assy with connector still con-
nected.
(2) Measure voltage between terminal 1 (+B) of clock
assy connector and body ground.
Standard voltage: 10  14 V
(3) Turn the ignition switch to ACC.
+B E ILL ACC
(4) Measure voltage between terminal 4 (ACC) of clock
assy connector and body ground.
I32727
Standard voltage: 10  14 V
(b) Check continuity.
(1) Check continuity Between terminal 2 (E) of clock
assy connector and body ground.
OK: Continuity exists
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE CLOCK ASSY
2004 COROLLA (RM1037U)
Author : Date : 832
05 668
DIAGNOSTICS  COMBINATION METER
057KO 04
THE AMBIENT TEMPERATURE DOES NOT DISPLAY
WIRING DIAGRAM
Combination Meter
3 26
IA6 C9 OUT SIDE TEMP+
B B
1
A7
Ambient
Temperature
Sensor
2
10
30
OUT SIDE TEMP
IA6 C9
B L B L
I37764
2004 COROLLA (RM1037U)
Author : Date : 833
05 669
DIAGNOSTICS  COMBINATION METER
INSPECTION PROCEDURE
1 INSPECT OUTER AMBIENT TEMPERATURE SENSOR
(a) Remove cooler (ambient temp. sensor) thermistor.
(b) Measure resistance between terminals 1 and 2 of cooler
(ambient temp. sensor) thermistor connector at each tem-
perature.
Resistance:
1 2
at 0 _C (0 _F) : 9.097  9.701 k&!
at 25 _C (77 _F) : 2.725  2.865 k&!
HINT:
As the temperature increases, the resistance decreases.
I30487
Resistance:
Resistance (k&! )
Temperature (_C)
I30156
NG REPLACE OUTER AMBIENT TEMPERATURE
SENSOR
OK
2 CHECK HARNESS AND CONNECTOR
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
CHECK AND REPLACE COMBINATION METER ASSY
2004 COROLLA (RM1037U)
Author : Date : 834