Pinpoint Test K: The Turn Signal Lamps Are Inoperative
Turn Signal, Cornering and Hazard Lamps
Pinpoint Test K: 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 Central Junction Box (CJB) provides voltage to the multifunction switch through circuit 1039 (BK/YE). The voltage is then routed from the multifunction switch to the LCM through circuit 385 (WH/RD). The LCM provides voltage back to the multifunction switch through circuit 44 (LB). When the multifunction switch is placed in the LH or RH TURN position, the voltage is routed to the LH or RH turn lamps.
- DTC B1873 (Turn Signal/Hazard Power Feed Short to Ground) - an on-demand DTC that sets when the LCM detects a short to ground from the turn/hazard power supply circuit.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Multifunction switch
- LCM
PINPOINT TEST K: 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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K1 CHECK THE STOPLAMP OPERATION
- Ignition OFF.
- Apply and release the brake pedal.
- Do the stoplamps operate correctly?
Yes
GO to K2.
No
REFER to Stoplamps Testing and Inspection.
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K2 CHECK THE OPERATION OF THE TURN LAMPS
- Ignition ON.
- Place the multifunction switch in the LH and RH TURN positions while observing the turn lamps.
- Do the turn lamps illuminate and not flash?
Yes
GO to K9.
No
GO to K3.
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K3 CHECK FOR VOLTAGE TO THE MULTIFUNCTION SWITCH
- Ignition OFF.
- Disconnect: Multifunction Switch C202a.
- Ignition ON.
- Measure the voltage between the multifunction switch C202a-9, circuit 1039 (BK/YE), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to K4.
No
VERIFY the CJB fuse 11 (15A) is OK. If OK, REPAIR the circuit for an open. TEST the system for normal operation. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.
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K4 CHECK CIRCUIT 385 (WH/RD) FOR VOLTAGE
- Ignition OFF.
- Connect: Multifunction Switch C202a.
- Disconnect: LCM C2145d.
- Ignition ON.
- Measure the voltage between the LCM C2145d-11, circuit 385 (WH/RD), harness side and ground; and between the LCM C2145d-12, circuit 385 (WH/RD), harness side and ground.
- Are the voltages greater than 10 volts?
Yes
GO to K6.
No
If the voltage is not greater than 10 volts at one of the pins, REPAIR the circuit in question. TEST the system for normal operation.
If the voltage is not greater than 10 volts at both pins, GO to K5.
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K5 CHECK CIRCUIT 385 (WH/RD) FOR AN OPEN
- Ignition OFF.
- Disconnect: Multifunction Switch C202a.
- Connect a fused jumper wire between the multifunction switch C202a-9, circuit 1039 (BK/YE), harness side and the multifunction switch C202a-10, circuit 385 (WH/RD), harness side.
- Ignition ON.
- Measure the voltage between the LCM C2145d-11, circuit 385 (WH/RD), harness side and ground; or between the LCM C2145d-12, circuit 385 (WH/RD), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
REMOVE the jumper wire. INSTALL a new multifunction switch. TEST the system for normal operation.
No
REMOVE the jumper wire. REPAIR the circuit. TEST the system for normal operation.
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K6 CHECK THE MULTIFUNCTION SWITCH
- Ignition OFF.
- Connect: LCM C2145d.
- Disconnect: Multifunction Switch C202a.
- Connect a fused jumper wire between the multifunction switch C202a-9, circuit 1039 (BK/YE), harness side and the multifunction switch C202a-10, circuit 385 (WH/RD), harness side.
- Ignition ON.
- Measure the voltage between the multifunction switch C202a-1, circuit 44 (LB), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
REMOVE the jumper wire. INSTALL a new multifunction switch. TEST the system for normal operation.
No
REMOVE the jumper wire. GO to K7.
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K7 CHECK CIRCUIT 44 (LB) FOR AN OPEN
- Ignition OFF.
- Disconnect: LCM C2145d.
- Measure the resistance between the multifunction switch C202a-1, circuit 44 (LB), harness side and the LCM C2145d-24, circuit 44 (LB), harness side; and between the multifunction switch C202a-1, circuit 44 (LB), harness side and the LCM C2145d-25, circuit 44 (LB), harness side.
- Are the resistances less than 5 ohms?
Yes
GO to K8.
No
REPAIR the circuit in question. TEST the system for normal operation.
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K8 CHECK CIRCUIT 44 (LB) FOR A SHORT TO GROUND
- Measure the resistance between the multifunction switch C202a-1, circuit 44 (LB), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to K10.
No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
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K9 CHECK CIRCUIT 44 (LB) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: Multifunction Switch C202a.
- Disconnect: LCM C2145d.
- Ignition ON.
- Measure the voltage between the multi-function switch C202a-1, circuit 44 (LB), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit. TEST the system for normal operation.
No
GO to K10.
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K10 CHECK FOR CORRECT LCM OPERATION
- Disconnect all the LCM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the LCM 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 LCM. 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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