Turn Signal Light Circuit

LIGHTING: LIGHTING SYSTEM: Turn Signal Light Circuit
- Turn Signal Light Circuit

DESCRIPTION

The turn signal flasher relay (Marking: FLASH) 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:





*: w/ Door Mirror Turn Signal Light

B -- INSPECT HEADLIGHT ASSEMBLY

C -- INSPECT REAR COMBINATION LIGHT

D -- INSPECT DOOR MIRROR TURN SIGNAL LIGHT
A -- Continue to next step.

2. INSPECT FUSE (ECU-IG2, HAZ)

(a) Remove the ECU-IG2 fuse from the instrument panel junction block.

(b) Remove the HAZ fuse from the engine room No. 1 relay block.

(c) Measure the resistance of the fuses.

Standard resistance:

Below 1 Ohms

NG -- REPLACE FUSE
OK -- Continue to next step.

3. CHECK WIRE HARNESS (BATTERY - TURN SIGNAL FLASHER RELAY)





(a) Remove the turn signal flasher relay from the instrument panel junction block.

(b) Measure the voltage of the wire harness side connectors.

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

4. INSPECT HEADLIGHT DIMMER SWITCH





(a) Remove the headlight dimmer switch.

(b) Inspect the turn signal switch.

(c) Measure the resistance of the switch.

Standard resistance:





NG -- REPLACE HEADLIGHT DIMMER SWITCH
OK -- Continue to next step.

5. CHECK WIRE HARNESS (HEADLIGHT DIMMER SWITCH - INSTRUMENT PANEL JUNCTION BLOCK)





(a) Remove the turn signal flasher relay.

(b) Disconnect the E12 headlight dimmer switch connector.

(c) Measure the resistance of the wire harness side connectors and junction block.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR

OK -- REPLACE TURN SIGNAL FLASHER RELAY

6. INSPECT HEADLIGHT ASSEMBLY





(a) Remove the headlight assembly.

(b) Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 2, then check that the light comes on.

HINT
Be sure to check the bulb first.

OK:

Light comes on.

NG -- REPLACE HEADLIGHT ASSEMBLY
OK -- Continue to next step.

7. CHECK WIRE HARNESS (INSTRUMENT PANEL JUNCTION BLOCK - HEADLIGHT ASSEMBLY)





(a) Disconnect the A12 (for LH) and A24 (for RH) headlight assembly connectors.

(b) Remove the turn signal flasher relay.

(c) Measure the resistance of the wire harness side connectors.

Standard resistance:

for RH side
for LH side










NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR

OK -- REPAIR OR REPLACE HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - BODY GROUND)

8. INSPECT REAR COMBINATION LIGHT

(a) Remove the rear combination light.





(b) Connect the positive (+) lead from the battery to terminal 5 and the negative (-) lead to terminal 1, then check that the light comes on.

HINT
Be sure to check the bulb first.

OK:

Light comes on.

NG -- REPLACE REAR COMBINATION LIGHT
OK -- Continue to next step.

9. CHECK WIRE HARNESS (INSTRUMENT PANEL JUNCTION BLOCK - REAR COMBINATION LIGHT)





(a) Disconnect the K12 (for RH) and K14 (for LH) rear combination light connectors.

(b) Remove the turn signal flasher relay.

(c) Measure the resistance of the wire harness side connectors.

Standard resistance:

for RH side
for LH side










NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR

OK -- REPAIR OR REPLACE HARNESS AND CONNECTOR (REAR COMBINATION LIGHT - BODY GROUND)

10. INSPECT DOOR MIRROR TURN SIGNAL LIGHT

(a) Remove the door mirror turn signal light.





(b) Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 2, and then check that the light comes on.

OK:

Light comes on.

NG -- REPLACE DOOR MIRROR TURN SIGNAL LIGHT
OK -- Continue to next step.

11. CHECK WIRE HARNESS (INSTRUMENT PANEL JUNCTION BLOCK - OUTER REAR VIEW MIRROR)

(a) for TMC Made





(1) Disconnect the H3 (for LH) and G4 (for RH) outer rear view mirror connectors.

(2) Remove the turn signal flasher relay.

(3) Measure the resistance of the wire harness side connectors.

Standard resistance:

for LH side
for RH side










(b) for TMMC Made





(1) Disconnect the H3 (for LH) and G4 (for RH) outer rear view mirror connectors.

(2) Remove the turn signal flasher relay.

(3) Measure the resistance of the wire harness side connectors.

Standard resistance:

for LH side
for RH side










NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR

OK -- REPLACE OUTER REAR VIEW MIRROR