Pinpoint Test M: The Turn Signal Lamps Are Always On
Turn Signal and Hazard Lamps
Pinpoint Tests
Pinpoint Test M: The Turn Signal Lamps Are Always On
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 reference signals to the multifunction switch through the LH and RH turn signal request input circuits. 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 provides voltage to the appropriate turn lamps.
- DTC B2281 (Right Turn Switch Short to Ground) - an on-demand DTC that sets when the SJB detects the RH turn signal switch input is short to ground.
- DTC B2282 (Left Turn Switch Short to Ground) - an on-demand DTC that sets when the SJB detects the LH turn signal switch input is short to ground.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Multifunction switch
- SJB
PINPOINT TEST M: THE TURN SIGNAL LAMPS ARE ALWAYS ON
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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M1 CHECK THE MULTIFUNCTION SWITCH
- Ignition OFF.
- Disconnect: Multifunction Switch C202.
- Ignition ON.
- Do the turn lamps continue to flash on and off?
Yes
GO to M2.
No
INSTALL a new multifunction switch. REFER to Steering Column Switches Steering Column Multifunction Switch. CLEAR the DTCs. REPEAT the self-test.
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M2 CHECK THE TURN SIGNAL REQUEST INPUT CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: SJB C2280b.
- Measure the resistance between the multifunction switch C202-2 (LH turn lamps), circuit CLS20 (BN/BU), harness side and ground; or between the multifunction switch C202-3 (RH turn lamps), circuit CLS24 (BN/WH), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to M3.
No
REPAIR circuit CLS20 (BN/BU) (LH turn signal) or circuit CLS24 (BN/WH) (RH turn signal) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
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M3 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. CLEAR any DTCs. REPEAT the self-test.
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