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 in the LH TURN position, the SJB provides on/off voltage through circuit CLS21 (BU/GN) to the LH front turn lamp. Circuit GD120 (BK/GN) provides ground to the LH front turn lamp.
When the SJB detects the multifunction switch in the RH TURN position, the SJB provides on/off voltage through circuit CLS25 (YE/VT) to the RH front turn lamp. Circuit GD164 (BK/VT) provides ground to the RH front turn lamp.
The rear lamps are combination stop/turn lamps that are controlled through the rear stoplamp circuitry.
B2A2A-B2A29:
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.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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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 CIRCUIT CLS21 (BU/GN) (LH TURN) OR CIRCUIT CLS25 (YE/VT) (RH TURN) 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 B2A28 or B2A2A present?
Yes
GO to M5.
No
GO to M7.
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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 B2A2A).
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: SJB Self-Test.
- Repeat the SJB on-demand self-test.
- Is DTC B2A28 or B2A2A still present?
Yes
GO to M6.
No
INSTALL a new bulb holder in question. RUN the on-demand self-test (required to clear certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
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M6 CHECK CIRCUIT CLS21 (BU/GN) (DTC B2A2A) OR CIRCUIT CLS25 (YE/VT) (DTC B2A28) 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. RUN the on-demand self-test (required to clear certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. 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 THE GROUND CIRCUIT FOR AN OPEN
- Disconnect: Negative Battery Cable.
- Measure the resistance between the LH front turn lamp C1023-1, circuit GD120 (BK/GN), harness side and ground; or between the RH front turn lamp C1043-1, circuit GD164 (BK/VT), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
INSTALL a new bulb holder. CLEAR the DTCs. REPEAT the self-test
No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test
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M9 CHECK CIRCUIT CLS21 (BU/GN) (LH TURN) OR CIRCUIT CLS25 (YE/VT) (RH TURN) 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. 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. 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.
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