Turn Signals: Testing and Inspection
LIGHTING: LIGHTING SYSTEM: Turn Signal Light Circuit
Turn Signal Light Circuit
DESCRIPTION
Receiving the signal of the turn signal switch from the cowl side junction block ECU LH, the cowl side junction block ECU LH makes the turn signal light come on.
The cowl side junction block ECU LH activates the flasher relay while the theft deterrent system gives the warning and turns on the turn signal light and the hazard warning light.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK OPERATION (TURN SIGNAL LIGHT)
(a) When the turn signal light switch is operated, check that the appropriate turn signal light flashes.
Result:
D -- REPLACE REAR COMBINATION LIGHT BULB (TURN LH OR TURN RH)
C -- REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY (LH OR RH)
B -- REPLACE FRONT TURN SIGNAL LIGHT BULB (TURN LH OR TURN RH)
A -- Continue to next step.
2. PERFORM ACTIVE TEST USING TECHSTREAM
(a) Select the Active Test, use the Techstream to generate a control command, and then check that the turn signal light flashes.
Cowl side junction block ECU LH:
OK:
Turn signal light flashes.
NG -- INSPECT FUSE (TURN-HAZ, LH-IG)
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
3. INSPECT FUSE (TURN-HAZ, LH-IG)
(a) Remove the LH-IG fuse from the cowl side junction block LH.
(b) Remove the TURN-HAZ fuse from the engine room No. 1 junction block.
(c) Measure the resistance of the fuses.
Standard resistance:
Below 1 Ohms
NG -- REPLACE FUSE
OK -- Continue to next step.
4. CHECK WIRE HARNESS (TURN SIGNAL FLASHER - BATTERY AND BODY GROUND)
(a) Disconnect the K25 flasher connector.
(b) Measure the voltage and resistance of the wire harness side connector.
Standard voltage:
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
5. CHECK WIRE HARNESS (TURN SIGNAL FLASHER - MAIN BODY ECU LH)
(a) Disconnect the K25 flasher connector.
(b) Disconnect the PA ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
6. REPLACE TURN SIGNAL FLASHER
(a) Temporarily replace the turn signal flasher with a new or normally functioning one.
(b) Check that the turn signal flasher operates.
OK:
Front turn signal light bulb (turn LH) flashes.
OK -- END
NG -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
7. REPLACE FRONT TURN SIGNAL LIGHT BULB (TURN LH OR TURN RH)
(a) Temporarily replace the front turn signal light bulb (turn LH or turn RH) with a new or normally functioning one.
(b) Check that the front turn signal light bulb (turn LH or turn RH) flashes.
OK:
Front turn signal light bulb (turn LH or turn RH) flashes.
OK -- END
NG -- Continue to next step.
8. CHECK WIRE HARNESS (TURN SIGNAL FLASHER - HEADLIGHT ASSEMBLY (TURN LH OR TURN RH) - BODY GROUND)
(a) Check the wire harness between the headlight (turn LH) and turn signal flasher, and the headlight (turn LH) and body ground.
(1) Disconnect the K25 flasher connector.
(2) Disconnect the B11 headlight connector.
(3) Measure the resistance of the wire harness side connectors.
Standard resistance:
(b) Check the wire harness between the headlight (turn RH) and turn signal flasher, and the headlight (turn RH) and body ground.
(1) Disconnect the K25 flasher connector.
(2) Disconnect the B2 headlight connector.
(3) Measure the resistance of the wire harness side connectors.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
9. REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY (LH OR RH)
(a) Temporarily replace the side turn signal light assembly (LH or RH) with a new or normally functioning one.
(b) Check that the side turn signal light assembly (LH or RH) flashes.
OK:
Side turn signal light assembly (LH or RH) flashes.
OK -- END
NG -- Continue to next step.
10. CHECK WIRE HARNESS (TURN SIGNAL FLASHER - SIDE TURN SIGNAL LIGHT ASSEMBLY (LH OR RH) - BODY GROUND)
(a) Check the wire harness between the side turn signal light assembly (LH) and turn signal flasher, and the side turn signal light assembly (LH) and body ground.
(1) Disconnect the K25 flasher connector.
(2) Disconnect the side turn signal light assembly connector.
(3) Measure the resistance of the wire harness side connectors.
Standard resistance:
(b) Check the wire harness between the side turn signal light assembly (RH) and turn signal flasher, and the side turn signal light assembly (RH) and body ground.
(1) Disconnect the K25 flasher connector.
(2) Disconnect the side turn signal light assembly connector.
(3) Measure the resistance of the wire harness side connectors.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
11. REPLACE REAR COMBINATION LIGHT BULB (TURN LH OR TURN RH)
(a) Temporarily replace the rear combination light bulb (turn LH or turn RH) with a new or normally functioning one.
(b) Check that the rear combination light bulb (turn LH or turn RH) flashes.
OK:
Rear combination light bulb (turn LH or turn RH) flashes.
OK -- END
NG -- Continue to next step.
12. CHECK WIRE HARNESS (TURN SIGNAL FLASHER - REAR COMBINATION LIGHT (TURN LH OR TURN RH) - BODY GROUND)
(a) Check the wire harness between the rear combination light (turn LH) and turn signal flasher, and the rear combination light (turn LH) and body ground.
(1) Disconnect the K25 flasher connector.
(2) Disconnect the X1 combination light connector.
(3) Measure the resistance of the wire harness side connectors.
Standard resistance:
(b) Check the wire harness between the rear combination light (turn RH) and turn signal flasher, and the rear combination light (turn RH) and body ground.
(1) Disconnect the K25 flasher connector.
(2) Disconnect the X3 combination light connector.
(3) Measure the resistance of the wire harness side connectors.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE