Pinpoint Test J: The Turn Signal Lamps Are Inoperative
Turn Signal and Hazard Lamps
Pinpoint Tests
Pinpoint Test J: The Turn Signal Lamps Are Inoperative
Refer to Wiring Diagram Set 90, Turn Signal/Stop/Hazard Lamps for schematic and connector information. Diagrams By Number
Normal Operation
The Smart Junction Box (SJB) sends voltage signals to the multifunction switch to monitor the LH and RH turn requests. When the multifunction switch is placed in the LH or RH TURN position, the voltage signal is routed to ground. When the SJB detects the multifunction switch in the LH or RH TURN position, the SJB sends voltage to the appropriate turn lamps.
NOTE: The SJB fuse 6 (20A) supplies voltage for all the stop and turn lamps.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Multifunction switch
- SJB
PINPOINT TEST J: THE TURN SIGNAL LAMPS ARE INOPERATIVE
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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J1 CHECK THE STOPLAMP OPERATION
- Apply the brake pedal and observe the stoplamps.
- Do the stoplamps operate correctly?
Yes
GO to J2.
No
REFER to Stoplamps Special Tool(s) Used With Diagnostics.
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J2 CHECK THE MULTIFUNCTION SWITCH INPUT PID
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: SJB DataLogger .
- Monitor the SJB multifunction switch PID (T_SIG_SW) while placing the multifunction switch in the LH and RH turn positions.
- Does the PID agree with he switch position?
Yes
VERIFY the SJB fuse 6 (20A) is OK. If OK, GO to J6.
If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. After the repair: Diagrams By Number
If no DTCs are present, TEST the system for normal operation.
If DTC B106E is 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 is present, INSTALL a new SJB. REFER to Multifunction Electronic Modules Service and Repair. TEST the system for normal operation.
No
GO to J3.
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J3 CHECK FOR A VOLTAGE SIGNAL TO THE MULTIFUNCTION SWITCH
- Ignition OFF.
- Disconnect: Multifunction Switch C202a .
- Ignition ON.
- For an inoperative LH turn signal, measure the voltage between the multifunction switch C202a-2, circuit CLS39 (VT/WH), harness side and ground.
- For an inoperative RH turn signal, measure the voltage between the multifunction switch C202a-3, circuit CLS41 (GY/YE), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to J4.
No
GO to J5.
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J4 BYPASS THE MULTIFUNCTION SWITCH
- For an inoperative LH turn signal, connect a fused jumper wire between the multifunction switch C202a-2, circuit CLS39 (VT/WH), harness side and the multifunction switch C202-1, circuit GD114 (BK/BU), harness side.
- For an inoperative RH turn signal, connect a fused jumper wire between the multifunction switch C202a-3, circuit CLS41 (GY/YE), harness side and the multifunction switch C202-1, circuit GD114 (BK/BU), harness side.
- Do the turn signals in question flash on and off?
Yes
REMOVE the jumper wire. INSTALL a new multifunction switch. REFER to Steering Column Switches Steering Column Multifunction Switch. TEST the system for normal operation.
No
REMOVE the jumper wire. REPAIR circuit GD114 (BK/BU) for an open. TEST the system for normal operation.
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J5 CHECK THE MULTIFUNCTION SWITCH INPUT CIRCUIT FOR AN OPEN
- Disconnect: SJB C2280b .
- For an inoperative LH turn signal, measure the resistance between the multifunction switch C202a-2, circuit CLS39 (VT/WH), harness side and the SJB C2280b-42, circuit CLS39 (VT/WH), harness side.
- For an inoperative RH turn signal, measure the resistance between the multifunction switch C202a-3, circuit CLS41 (GY/YE), harness side and the SJB C2280b-29, circuit CLS41 (GY/YE), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to J6.
No
REPAIR circuit CLS39 (VT/WH) (LH turn signal) or circuit CLS41 (GY/YE) (RH turn signal) for an open. TEST the system for normal operation.
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J6 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 Service and Repair. 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.
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