Pinpoint Test P: One Turn Signal/Hazard Lamp Is Inoperative/Always On

Turn Signal and Hazard Lamps

Pinpoint Test P: One Turn Signal/Hazard Lamp Is Inoperative/Always On

Refer to Wiring Diagram Set 90, Turn Signal/Stop/Hazard Lamps for schematic and connector information. Diagrams By Number

Normal Operation

When the Smart Junction Box (SJB) detects the multifunction switch in the LH TURN position, the SJB provides voltage to the LH front and mirror turn lamps.

When the SJB detects the multifunction switch in the RH TURN position, the SJB provides voltage to the RH front and mirror turn lamps.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Mirror turn lamp
- Exterior mirror
- Headlamp assembly
- SJB

PINPOINT TEST P: ONE TURN SIGNAL/HAZARD LAMP IS INOPERATIVE/ALWAYS ON

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

-------------------------------------------------
P1 DETERMINE IF A TURN LAMP IS ALWAYS ON

- Ignition ON.
- Monitor the turn lamps.
- Is any turn lamp always on?

Yes
GO to P2.

No
GO to P3.

-------------------------------------------------
P2 CHECK THE TURN SIGNAL LAMP VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE

- Ignition OFF.
- Disconnect: SJB C2280f (Front Turn Lamp).
- Disconnect: SJB C2280c (Mirror Turn Signal Lamp).
- Ignition ON.
- Does the turn lamp in question continue to illuminate?

Yes
REPAIR the turn lamp voltage supply circuit in question for a short to voltage. TEST the system for normal operation.

No
GO to P9.

-------------------------------------------------
P3 CHECK FOR VOLTAGE TO THE INOPERATIVE TURN LAMP

- Ignition OFF.
- Disconnect: Suspect Mirror or Headlamp.
- Turn the hazard lamps on.
- For an inoperative front turn lamp, measure the voltage between the LH headlamp C1021-1, circuit CLS21 (BU/GN), harness side and ground; or between the RH headlamp C1041-1, circuit CLS25 (YE/VT), harness side and ground.

- For an inoperative mirror turn lamp, measure the voltage between the LH exterior mirror C516-3, circuit CLS20 (BN/BU), harness side and ground; or between the RH exterior mirror C625-3, circuit CLS24 (BN/WH), harness side and ground.

- Does the voltage alternate from 0 volts to greater than 10 volts?

Yes
GO to P4.

No
GO to P6.

-------------------------------------------------
P4 CHECK THE FOR VOLTAGE TO THE TURN LAMP USING THE CONNECTOR GROUND

- For an inoperative front turn lamp, measure the voltage between the LH headlamp C1021-1, circuit CLS21 (BU/GN), harness side and the LH headlamp C1021-10, circuit GD123 (BK/GY), harness side; or between the RH headlamp C1041-1, circuit CLS25 (YE/VT), harness side and the RH headlamp C1041-10, circuit GD123 (BK/GY), harness side.

- For an inoperative mirror turn lamp, measure the voltage between the LH exterior mirror C516-3, circuit CLS20 (BN/BU), harness side and the LH exterior mirror C516-8, circuit GD133 (BK), harness side; or between the RH exterior mirror C625-3, circuit CLS24 (BN/WH), harness side and the RH exterior mirror C625-8, circuit GD145 (BK/BU), harness side.

- Does the voltage alternate from 0 volts to greater than 10 volts?

Yes
For a front turn lamp, INSTALL a new headlamp assembly. REFER to Headlamp Assembly Service and Repair. TEST the system for normal operation.

For a mirror turn lamp, GO to P5.

No
REPAIR the ground circuit in question for an open. TEST the system for normal operation.

-------------------------------------------------
P5 CHECK THE MIRROR HARNESS FOR AN OPEN

- Check the mirror harness between the side turn lamp connector and the mirror connector for an open.
- Is the mirror harness OK?

Yes
INSTALL a new mirror turn lamp. REFER to Turn Signal Lamp - Outside Rear View Mirror Turn Signal Lamp - Outside Rear View Mirror. TEST the system for normal operation.

No
INSTALL a new exterior mirror. REFER to Rear View Mirrors Exterior Mirror. TEST the system for normal operation.

-------------------------------------------------
P6 REPEAT THE SELF-TEST AND RECHECK FOR VOLTAGE TO THE TURN LAMP

- Turn the hazard lamps off.
- Enter the following diagnostic mode on the scan tool: SJB Self-Test.
- Clear the DTCs and repeat the self-test (required to enable the turn lamp output driver if DTC B106E is present).
- Turn the hazard lamps on.
- For an inoperative front turn lamp, measure the voltage between the LH headlamp C1021-1, circuit CLS21 (BU/GN), harness side and ground; or between the RH headlamp C1041-1, circuit CLS25 (YE/VT), harness side and ground.

- For an inoperative mirror turn lamp, measure the resistance between the LH exterior mirror C516-3, circuit CLS20 (BN/BU), harness side and ground; or between the RH exterior mirror C625-3, circuit CLS24 (BN/WH), harness side and ground.

- Is the resistance greater than 10,000 ohms?

Yes
GO to P8.

No
REPAIR the circuit in question for a short to ground. After the repair:

If no DTCs were present, TEST the system for normal operation.

If DTC B106E was present, CLEAR the DTCs and REPEAT the self-test (required to enable the turn lamp output driver if DTC B106E is present). TEST the system for normal operation.

If DTC B106F was present, INSTALL a new SJB. REFER to Multifunction Electronic Modules Smart Junction Box (SJB). TEST the system for normal operation.

-------------------------------------------------
P8 CHECK THE TURN LAMP VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

- For an inoperative front turn lamp, measure the resistance between the LH headlamp C1021-1, circuit CLS21 (BU/GN), harness side and the SJB C2280f-21, circuit CLS21 (BU/GN), harness side; or between the RH headlamp C1041-1, circuit CLS25 (YE/VT), harness side and the SJB C2280f-23, circuit CLS25 (YE/VT), harness side.

- For an inoperative mirror turn lamp, measure the resistance between the LH exterior mirror C516-3, circuit CLS20 (BN/BU), harness side and the SJB C2280c-21, circuit CLS20 (BN/BU), harness side; or between the RH exterior mirror C625-3, circuit CLS24 (BN/WH), harness side and the SJB C2280c-19, circuit CLS24 (BN/WH), harness side.

- Is the resistance less than 5 ohms?

Yes
GO to P9.

No
REPAIR the turn lamp voltage supply circuit in question for an open. TEST the system for normal operation.

-------------------------------------------------
P9 CHECK FOR CORRECT SJB OPERATION

- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new SJB. REFER to Multifunction Electronic Modules Smart Junction Box (SJB). TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

-------------------------------------------------