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
The Smart Junction Box (SJB) sends voltage signals to the multifunction switch to monitor the LH turn request and the RH turn request. When the multifunction switch is switched to 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 sends voltage to the appropriate 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 DETERMINE IF A TURN LAMP IS ALWAYS ON
- Ignition ON.
- Monitor the turn lamps.
- Is any turn lamp always on?
Yes
GO to P2.
No
GO to P3.
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P2 CHECK THE TURN SIGNAL LAMP VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB C2280f (Front Turn Lamp).
- Disconnect: SJB C2280c (Rear Turn Lamp).
- 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 P9.
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P3 USE THE RECORDED DTCs FROM THE SJB SELF-TEST
- Check the recorded results from the SJB on-demand self-test.
- Was DTC B2049, B2051, B2A27 or B2A29 present?
Yes
GO to P4.
No
GO to P7.
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P4 CHECK FOR VOLTAGE TO THE TURN LAMP (OPEN DTC PRESENT)
- Ignition OFF.
- Disconnect: Inoperative Turn Lamp.
- Turn the hazard lamps on.
- For a front turn lamp, 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.
- For a rear turn lamp, measure the voltage between the LH rear turn lamp C414-6, circuit CLS23 (GY/OG), harness side and ground; or between the RH rear turn lamp C417-6, circuit CLS27 (GN/OG), harness side and ground.
- Does the voltage alternate from 0 volts to greater than 10 volts?
Yes
GO to P6.
No
GO to P5.
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P5 CHECK THE TURN LAMP VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
- Turn the hazard lamps off.
- Disconnect: SJB C2280f (Front Turn Lamp).
- Disconnect: SJB C2280c (Rear Turn Lamp).
- For a front turn lamp, 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.
- For a rear turn lamp, measure the resistance between the LH rear turn lamp C414-6, circuit CLS23 (GY/OG), harness side and the SJB
C2280c-21, circuit CLS23 (GY/OG), harness side; or between the RH rear turn lamp C417-6, circuit CLS27 (GN/OG), harness side and the SJB C2280c-19, circuit CLS27 (GN/OG), harness side
- Is the resistance less than 5 ohms?
Yes
GO to P9.
No
REPAIR the circuit in question for an open. CLEAR the DTCs. REPEAT the self-test
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P6 CHECK FOR VOLTAGE TO THE TURN LAMP USING THE CONNECTOR GROUND
- For a front turn lamp, 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 GD123 (BK/GY), harness side.
- For a rear turn lamp, measure the voltage between the LH rear turn lamp C414-6, circuit CLS23 (GY/OG), harness side and the LH rear turn lamp C414-1, circuit GD149 (BK/GY), harness side; or between the RH rear turn lamp C417-6, circuit CLS27 (GN/OG), harness side and the RH rear turn lamp C417-1, circuit GD148 (BK/YE), harness side.
- 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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P7 REPEAT THE ON-DEMAND SELF-TEST AND CHECK FOR VOLTAGE TO THE TURN LAMP
- Ignition OFF.
- Disconnect: Inoperative Turn Lamp.
- Ignition ON.
- 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.
- For a front turn lamp, 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.
- For a rear turn lamp, measure the voltage between the LH rear turn lamp C414-6, circuit CLS23 (GY/OG), harness side and ground; or between the RH rear turn lamp C417-6, circuit CLS27 (GN/OG), harness side and ground.
- 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 P8.
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P8 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 (Rear Turn Lamp).
- For a front turn lamp, measure the resistance 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.
- For a rear turn lamp, measure the resistance between the LH rear turn lamp C414-6, circuit CLS23 (GY/OG), harness side and ground; or between the RH rear turn lamp C417-6, circuit CLS27 (GN/OG), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to P9.
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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P9 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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