Turn Signal Light Circuit
LIGHTING: LIGHTING SYSTEM: Turn Signal Light Circuit
Turn Signal Light Circuit
DESCRIPTION
The turn signal flasher assembly in the main body ECU turns on when it receives signals from the headlight dimmer switch integrated with the turn signal switch, causing the turn signal lights to flash.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK OPERATION OF TURN SIGNAL LIGHT
(a) When the turn signal light switch is operated, check that the appropriate turn signal light flashes.
Result:
D -- INSPECT BULB (REAR TURN SIGNAL LIGHT BULB)
C -- INSPECT SIDE TURN SIGNAL LIGHT ASSEMBLY
B -- INSPECT BULB (FRONT TURN SIGNAL BULB)
A -- Continue to next step.
2. INSPECT FUSE (ECU-IG NO. 2, TURN-HAZ)
(a) Remove the ECU IG NO. 2 fuse from the main body ECU.
(b) Remove the TURN-HAZ fuse from the engine room relay block.
(c) Measure the resistance according to the value (s) in the table below.
Standard resistance:
(d) Reinstall the ECU IG NO. 2 and TURN-HAZ fuses.
NG -- REPLACE FUSE
OK -- Continue to next step.
3. INSPECT HEADLIGHT DIMMER SWITCH
(a) Remove the headlight dimmer switch.
(b) Inspect the turn signal light switch.
(c) Measure the resistance according to the value (s) in the table below.
Standard resistance:
(d) Reinstall the headlight dimmer switch.
NG -- REPLACE HEADLIGHT DIMMER SWITCH
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH - MAIN BODY ECU)
(a) Disconnect the C11 headlight dimmer switch connector.
(b) Disconnect the 2S main body ECU connector.
(c) Measure the resistance according to the value (s) in the table below.
Standard resistance:
(d) Reconnect the headlight dimmer switch connector.
(e) Reconnect the main body ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (TURN-HAZ FUSE - MAIN BODY ECU)
(a) Disconnect the 2B main body ECU connector.
(b) Measure the voltage according to the value (s) in the table below.
Standard voltage:
(c) Reconnect the main body ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BODY GROUND)
(a) Disconnect the 2E main body ECU connector.
(b) Measure the resistance according to the value (s) in the table below.
Standard resistance:
(c) Reconnect the main body ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
7. INSPECT MAIN BODY ECU
(a) Remove the main body ECU.
(b) Remove the turn signal flasher assembly from the main body ECU.
(c) Remove the IG1 relay from the main body ECU.
(d) Measure the resistance according to the value (s) in the table below.
Standard resistance:
(e) Reinstall the IG1 relay.
(f) Reinstall the turn signal flasher assembly.
(g) Reinstall the main body ECU.
NG -- REPLACE MAIN BODY ECU
OK -- REPLACE TURN SIGNAL FLASHER ASSEMBLY
8. INSPECT BULB (FRONT TURN SIGNAL BULB)
(a) Remove the front turn signal light.
(b) Apply battery voltage to the terminals and check that the front turn signal light illuminates.
OK:
(c) Reinstall the front turn signal light.
NG -- REPLACE BULB
OK -- Continue to next step.
9. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - FRONT TURN SIGNAL LIGHT BULB)
(a) Disconnect the A6 and A12 front turn signal light connectors.
(b) Disconnect the 2B main body ECU connector.
(c) Measure the resistance according to the value (s) in the table below.
Standard resistance:
(d) Reconnect the front turn signal light connectors.
(e) Reconnect the main body ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
10. CHECK HARNESS AND CONNECTOR (FRONT TURN SIGNAL LIGHT - BODY GROUND)
(a) Disconnect the A6 and A12 front turn signal light connectors.
(b) Measure the resistance according to the value (s) in the table below.
Standard resistance:
(c) Reconnect the front turn signal light connectors.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
11. INSPECT MAIN BODY ECU
(a) Remove the main body ECU.
(b) Remove the turn signal flasher assembly from the main body ECU.
(c) Measure the resistance according to the value (s) in the table below.
Standard resistance:
(d) Reinstall the turn signal flasher assembly.
(e) Reinstall the main body ECU.
NG -- REPLACE MAIN BODY ECU
OK -- REPLACE TURN SIGNAL FLASHER ASSEMBLY
12. INSPECT SIDE TURN SIGNAL LIGHT ASSEMBLY
(a) Remove the side turn signal light assembly from the outer rear view mirror assembly.
(b) Apply battery voltage to the terminals and check that the side turn signal light illuminates.
OK:
(c) Reinstall the side turn signal light assembly.
NG -- REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY
OK -- Continue to next step.
13. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY (SYSTEM VOLTAGE)
(a) Disconnect the D2 and E2 outer rear view mirror assembly connectors.
(b) Measure the voltage according to the value (s) in the table below
Standard voltage:
(c) Reconnect the outer rear view mirror assembly connectors.
NG -- CHECK HARNESS AND CONNECTOR (OUTER REAR VIEW MIRROR ASSEMBLY - MAIN
BODY ECU)
OK -- REPLACE OUTER REAR VIEW MIRROR ASSEMBLY
14. CHECK HARNESS AND CONNECTOR (OUTER REAR VIEW MIRROR ASSEMBLY - MAIN BODY ECU)
(a) Disconnect the D2 and E2 side turn signal light assembly connectors.
(b) Disconnect the 2S main body ECU connector.
(c) Measure the resistance according to the value (s) in the table below.
Standard resistance:
(d) Reconnect the outer rear view mirror assembly connectors.
(e) Reconnect the main body ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
15. CHECK HARNESS AND CONNECTOR (OUTER REAR VIEW MIRROR ASSEMBLY - BODY GROUND)
(a) Disconnect the D2 and E2 outer rear view mirror assembly connectors.
(b) Measure the resistance according to the value (s) in the table below.
Standard resistance:
(c) Reconnect the outer rear view mirror assembly connectors.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
16. INSPECT MAIN BODY ECU
(a) Remove the main body ECU.
(b) Remove the turn signal flasher assembly from the main body ECU.
(c) Measure the resistance according to the value (s) in the table below.
Standard resistance:
(d) Reinstall the turn signal flasher assembly.
(e) Reinstall the main body ECU.
NG -- REPLACE MAIN BODY ECU
OK -- REPLACE TURN SIGNAL FLASHER ASSEMBLY
17. INSPECT BULB (REAR TURN SIGNAL LIGHT BULB)
(a) Remove the rear combination light assembly.
(b) Apply battery voltage to the terminals and check that the rear turn signal light illuminates.
OK:
(c) Reinstall the rear combination light assembly.
NG -- REPLACE BULB
OK -- Continue to next step.
18. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - REAR TURN SIGNAL LIGHT BULB)
(a) Disconnect the H5 and H6 rear combination light assembly connectors.
(b) Disconnect the 2A main body ECU connector.
(c) Measure the resistance according to the value (s) in the table below.
Standard resistance:
(d) Reconnect the rear combination light assembly connectors.
(e) Reconnect the main body ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
19. CHECK HARNESS AND CONNECTOR (REAR TURN SIGNAL LIGHT - BODY GROUND)
(a) Disconnect the H5 and H6 rear combination light assembly connectors.
(b) Measure the resistance according to the value (s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
20. INSPECT MAIN BODY ECU
(a) Remove the main body ECU.
(b) Remove the turn signal flasher assembly from the main body ECU.
(c) Measure the resistance according to the value (s) in the table below.
Standard resistance:
(d) Reinstall the turn signal flasher assembly.
(e) Reinstall the main body ECU.
NG -- REPLACE MAIN BODY ECU
OK -- REPLACE TURN SIGNAL FLASHER ASSEMBLY