Pinpoint Test M: One Turn Signal/Hazard Lamp Is Inoperative/Always On
Turn Signal and Hazard Lamps
Pinpoint Tests
Pinpoint Test M: 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 is in the LH TURN position, the SJB provides on/off voltage to the LH front turn lamp.
When the SJB detects the multifunction switch is in the RH TURN position, the SJB provides on/off voltage to the RH front turn lamp.
The rear lamps are combination stop/turn lamps that are controlled through the rear stoplamp circuitry.
B2A2A-B106F:
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Bulb holder
- SJB
PINPOINT TEST M: 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.
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M1 CHECK THE STOPLAMPS
- Apply and release the brake pedal while observing the stoplamps.
- Do the stoplamps operate correctly?
Yes
GO to M2.
No
REFER to Stoplamps Testing and Inspection.
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M2 DETERMINE IF A TURN LAMP IS ALWAYS ON
- Ignition ON.
- Monitor the turn lamps.
- Is any turn lamp always on?
Yes
GO to M3.
No
GO to M4.
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M3 CHECK THE SJB TURN LAMP OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB C2280f.
- Ignition ON.
- Does the turn lamp in question continue to illuminate?
Yes
For the LH turn lamp, REPAIR circuit CLS21 (BU/GN). CLEAR the DTCs. REPEAT the self-test.
For the RH turn lamp, REPAIR circuit CLS25 (YE/VT). CLEAR the DTCs. REPEAT the self-test.
No
GO to M10.
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M4 USE THE RECORDED DTCs FROM THE SJB SELF-TEST
- Check the recorded results from the SJB on-demand self-test.
- Was DTC B2A27 or DTC B2A29 present?
Yes
GO to M7.
No
GO to M5.
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M5 CHECK THE BULB HOLDER FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: LH Front Turn Lamp C1023 (DTC B2A28).
- Disconnect: RH Front Turn Lamp C1043 (DTC B2A27).
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Clear the DTCs and repeat SJB Self-Test.
- Clear the DTCs and repeat the SJB on-demand self-test (required to enable the stoplamp output driver if DTC B106E is present).
- Measure the voltage between the LH front turn lamp C1023-3, circuit CLS21 (BU/GN), harness side and ground; or between the RH front turn lamp C1043-3, circuit CLS25 (YE/VT), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
INSTALL a new bulb holder in question. TEST the system for normal operation.
No
GO to M6.
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M6 CHECK THE SJB TURN LAMP OUTPUT CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: SJB C2280f.
- Measure the resistance between the SJB C2280f-21 (DTC B2A2A), circuit CLS21 (BU/GN), harness side and ground; or between the SJB C2280f-23 (DTC B2A28), circuit CLS25 (YE/VT), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to M10.
No
REPAIR the circuit in question for a short to ground. After the repair:
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 Body Control Systems. TEST the system for normal operation.
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M7 CHECK FOR VOLTAGE TO THE TURN LAMP
- Ignition OFF.
- Disconnect: Inoperative Turn Lamp.
- Activate the hazard flasher lamp function.
- Measure the voltage between the LH front turn lamp C1023-3, circuit CLS21 (BU/GN), harness side and ground; or between the RH front turn lamp C1043-3, circuit CLS25 (YE/VT), harness side and ground.
- Does the voltage alternate between 0 and greater than 10 volts?
Yes
GO to M8.
No
GO to M9.
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M8 CHECK FOR VOLTAGE TO THE TURN LAMP USING THE CONNECTOR GROUND
- Measure the voltage between the LH front turn lamp C1023-3, circuit CLS21 (BU/GN), harness side and the LH front turn lamp C1023-1, circuit GD120 (BK/GN), harness side; or between the RH front turn lamp C1043-3, circuit CLS25 (YE/VT), harness side and the RH front turn lamp C1043-1, circuit GD164 (BK/VT), harness side.
- Does the voltage alternate between 0 and greater than 10 volts?
Yes
INSTALL a new bulb holder. CLEAR the DTCs. REPEAT the self-test
No
REPAIR the circuit in question for an open. CLEAR the DTCs. REPEAT the self-test
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M9 CHECK THE SJB TURN LAMP OUTPUT CIRCUIT FOR AN OPEN
- Turn the hazard lamp function off.
- Disconnect: SJB C2280f.
- Measure the resistance between the LH front turn lamp C1023-3, circuit CLS21 (BU/GN), harness side and the SJB C2280f-21, circuit CLS21 (BU/GN), harness side; or between the RH front turn lamp C1043-3, circuit CLS25 (YE/VT), harness side and the SJB C2280f-23, circuit CLS25 (YE/VT), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to M10.
No
REPAIR the circuit in question for an open. CLEAR the DTCs. REPEAT the self-test
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M10 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 Body Control Systems. 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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