Pinpoint Test P: One Turn Signal/Hazard Lamp Is Inoperative/Always On
Turn Signal and Hazard Lamps
Pinpoint Tests
Pinpoint Test P: 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 voltage to the LH front and rear turn lamps.
When the SJB detects the multifunction switch in the RH TURN position, the SJB provides voltage to the RH front and rear turn lamps.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Bulb holder
- Rear lamp jumper harness
- SJB
PINPOINT TEST P: 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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P1 CHECK THE STOPLAMPS
- Apply and release the brake pedal while observing the stoplamps.
- Do the stoplamps operate correctly?
Yes
GO to P2.
No
REFER to Stoplamps. Testing and Inspection
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P2 DETERMINE IF A TURN LAMP IS ALWAYS ON
- Ignition ON.
- Monitor the turn lamps.
- Is any turn lamp always on?
Yes
GO to P3.
No
GO to P4.
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P3 CHECK THE TURN SIGNAL LAMP VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE
- Retrieve the DTCs from the on-demand self-test. Refer to the following table.
- Ignition OFF.
- Disconnect: SJB C2280f (DTC B2A27 or DTC B2A29).
- Disconnect: SJB C2280c (DTC B2049 or DTC B2051).
- Disconnect: SJB C2280d (DTC B2045 or DTC B2047).
- Ignition ON.
- Does the turn lamp in question continue to illuminate?
Yes
REPAIR the turn lamp voltage supply circuit in question. CLEAR the DTCs. REPEAT the self-test.
No
GO to P11.
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P4 USE THE RECORDED DTCs FROM THE SJB SELF-TEST
- Check the recorded results from the SJB on-demand self-test.
- Is DTC B2045, B2047, B2049, B2051, B2A27 or B2A29 present?
Yes
GO to P5.
No
GO to P8.
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P5 CHECK FOR VOLTAGE TO THE TURN LAMP (OPEN DTC PRESENT)
- Ignition OFF.
- Disconnect: Inoperative Turn Lamp.
- Turn the hazard lamps on.
- Measure the voltage between the inoperative turn lamp, harness side and ground as follows:
- Does the voltage alternate from 0 volts to greater than 10 volts?
Yes
GO to P7.
No
GO to P6.
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P6 CHECK THE TURN LAMP VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
- Turn the hazard lamps off.
- Disconnect: SJB C2280f (DTC B2A27 or DTC B2A29).
- Disconnect: SJB C2280c (DTC B2049 or DTC B2051).
- Disconnect: SJB C2280d (DTC B2045 or DTC B2047).
- Measure the resistance between the inoperative turn lamp, harness side and the SJB, harness side as follows:
- Is the resistance less than 5 ohms?
Yes
GO to P11.
No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test
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P7 CHECK THE FOR VOLTAGE TO THE TURN LAMP USING THE CONNECTOR GROUND
- Measure the voltage between the inoperative turn lamp pins, harness side and ground as follows:
- Does the voltage alternate from 0 volts to greater than 10 volts?
Yes
For a front turn lamp, INSTALL a new bulb holder. CLEAR the DTCs. REPEAT the self-test.
For a rear turn lamp, REPAIR or INSTALL a new rear lamp jumper harness. CLEAR the DTCs. REPEAT the self-test.
No
REPAIR the ground circuit in question for an open. CLEAR the DTCs. REPEAT the self-test.
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P8 CHECK FOR VOLTAGE TO THE TURN LAMP (OPEN DTC NOT PRESENT)
- Ignition OFF.
- Disconnect: Inoperative Turn Lamp.
- Ignition ON.
- Turn the hazard lamps on.
- Measure the voltage between the inoperative turn lamp, harness side and ground as follows:
- Does the voltage alternate from 0 volts to greater than 10 volts?
Yes
For a front turn lamp, INSTALL a new bulb holder. TEST the system for normal operation.
For a rear turn lamp, REPAIR or INSTALL a new rear lamp jumper harness for a short to ground. TEST the system for normal operation.
No
GO to P9.
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P9 REPEAT THE SELF-TEST AND RECHECK FOR VOLTAGE TO THE TURN LAMP
- Turn the hazard lamps off.
- Enter the following diagnostic mode on the scan tool: SJB Self-Test.
- Clear the DTCs and repeat the self-test (required to enable the turn lamp output driver if DTC B106E is present).
- Turn the hazard lamps on.
- Measure the voltage between the inoperative turn lamp, harness side and ground as follows:
- Does the voltage alternate from 0 volts to greater than 10 volts?
Yes
For a front turn lamp, INSTALL a new bulb holder. TEST the system for normal operation.
For a rear turn lamp, REPAIR or INSTALL a new rear lamp jumper harness for a short to ground. TEST the system for normal operation.
No
GO to P10.
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P10 CHECK THE TURN LAMP VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO GROUND
- Turn the hazard lamps off.
- Ignition OFF.
- Disconnect: SJB C2280f (Front Turn Lamp).
- Disconnect: SJB C2280c and C2280d (Rear Turn Lamp).
- Measure the resistance between the inoperative turn lamp, harness side and ground as follows:
- Is the resistance greater than 10,000 ohms?
Yes
GO to P11.
No
REPAIR the circuit in question for a short to ground. After the repair:
If no DTCs were present, TEST the system for normal operation.
If DTC B106E was 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 was present, INSTALL a new SJB. REFER to Body Control Systems. TEST the system for normal operation.
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P11 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. CLEAR the DTCs. REPEAT the self-test.
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