Pinpoint Test O: The Hazard Lamps Are Inoperative/Always On
Turn Signal and Hazard Lamps
Pinpoint Tests
Pinpoint Test O: The Hazard Lamps Are Inoperative/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 a voltage signal to the hazard flasher lamp switch. The hazard flasher lamp switch is a momentary contact switch. When the hazard flasher lamp switch is engaged, the voltage signal is routed to ground. When the SJB detects a request for the hazard lamps, the SJB provides voltage to all the front turn lamps and a message to the Body Control Module B (BCM-B) to flash the rear lamps on and off.
- DTC B2071 (Hazard Switch Signal Short to Ground) - an on-demand DTC that sets when the SJB detects a short to ground from the hazard flasher lamp switch input circuit.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Hazard flasher lamp switch
- SJB
PINPOINT TEST O: THE HAZARD LAMPS ARE 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.
-------------------------------------------------
O1 CHECK THE RECORDED DTCs FROM THE SJB SELF-TEST
- Check the recorded DTCs from the SJB self-test.
- Is DTC B2071 present?
Yes
GO to O2.
No
GO to O4.
-------------------------------------------------
O2 CHECK THE HAZARD FLASHER LAMP SWITCH
- Disconnect: Hazard Flasher Lamp Switch C2267.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: SJB Self-Test.
- Repeat the SJB self-test.
- Is DTC B2071 still present?
Yes
GO to O3.
No
INSTALL a new hazard flasher lamp switch. REFER to Hazard Flasher Lamp Switch Service and Repair. CLEAR the DTCs. REPEAT the self-test.
-------------------------------------------------
O3 CHECK THE HAZARD FLASHER REQUEST INPUT CIRCUIT FOR A SHORT TO GROUND
- Disconnect: SJB C2280b.
- Measure the resistance between the hazard flasher lamp switch C2267-8, circuit CLS32 (BN/YE), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to O7.
No
REPAIR circuit CLS32 (BN/YE) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
-------------------------------------------------
O4 CHECK FOR A VOLTAGE REFERENCE SIGNAL TO THE HAZARD FLASHER LAMP SWITCH
- Ignition OFF.
- Disconnect: Hazard Flasher Lamp Switch C2267.
- Measure the voltage between the hazard flasher lamp switch C2267-8, circuit CLS32 (BN/YE), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to O6.
No
GO to O5.
-------------------------------------------------
O5 CHECK THE HAZARD FLASH REQUEST INPUT CIRCUIT FOR AN OPEN
- Disconnect: SJB C2280b.
- Measure the resistance between the SJB C2280b-48, circuit CLS32 (BN/YE), harness side and the hazard flasher lamp switch C2267-8, circuit CLS32 (BN/YE), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to O7.
No
REPAIR circuit CLS32 (BN/YE) for an open. TEST the system for normal operation.
-------------------------------------------------
O6 CHECK THE HAZARD FLASHER LAMP SWITCH GROUND CIRCUIT FOR AN OPEN
- Measure the voltage between the hazard flasher lamp switch C2267-8, circuit CLS32 (BN/YE), harness side and the hazard flasher lamp switch C2267-1, circuit GD116 (BK/VT), harness side.
- Is the voltage greater than 10 volts?
Yes
INSTALL a new hazard flasher lamp switch. REFER to Hazard Flasher Lamp Switch Service and Repair. CLEAR the DTCs. REPEAT the self-test.
No
REPAIR circuit GD116 (BK/VT) for an open. TEST the system for normal operation.
-------------------------------------------------
O7 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 the DTCs. REPEAT the self-test.
-------------------------------------------------