Pinpoint Test E: The Courtesy Lamps Stay On Continuously
Interior Lighting
Pinpoint Tests
Pinpoint Test E: The Courtesy Lamps Stay On Continuously
Refer to Wiring Diagram Set 117, Remote Keyless Entry and Alarm for schematic and connector information. Diagrams By Number
Refer to Wiring Diagram Set 89, Interior Lamps for schematic and connector information. Diagrams By Number
Normal Operation
The Smart Junction Box (SJB) sends a voltage signal to each door ajar switch, which is routed to ground when the door is closed (the door ajar switch is closed when the door is closed). When the door is opened, the signal to ground is interrupted, indicating an open door to the SJB.
The SJB also sends a voltage signal to the instrument panel dimmer switch. When the switch is rotated to the DOME LAMP position, the voltage signal is routed to ground, indicating a request to the SJB for the courtesy lamps.
When the SJB detects an open door, a request from the instrument panel dimmer switch or an unlock request from the Remote Keyless Entry (RKE) transmitter, the SJB provides voltage to the courtesy lamps.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Instrument panel dimmer switch
- Door ajar switch
- SJB
PINPOINT TEST E: THE COURTESY LAMPS STAY ON CONTINUOUSLY
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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E1 CHECK THE SJB DTCs FROM BOTH CONTINUOUS AND THE ON-DEMAND SELF-TESTS
- Use the recorded results from the SJB continuous and on-demand self-test.
- Is DTC B1688 or DTC B2A35 recorded?
Yes
For DTC B1688, GO to E2.
For DTC B2A35, GO to E4.
No
GO to E5.
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E2 CHECK THE INSTRUMENT PANEL DIMMER SWITCH
- Ignition OFF.
- Disconnect: Instrument Panel Dimmer Switch C2065.
- Close all the doors and wait 30 seconds.
- Do the courtesy lamps continue to illuminate?
Yes
GO to E3.
No
INSTALL a new instrument panel dimmer switch. REFER to Instrument Cluster and Panel Illumination Service and Repair. CLEAR the DTCs. REPEAT the self-test.
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E3 CHECK THE INTERIOR COURTESY LAMP REQUEST SIGNAL CIRCUIT FOR A SHORT TO GROUND
- Disconnect: SJB C2280b.
- Measure the resistance between the SJB C2280b-51, circuit CLN28 (GN/BU), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to E9.
No
REPAIR circuit CLN28 (GN/BU) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
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E4 CHECK THE COURTESY LAMP OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB C2280a.
- Ignition ON.
- Observe the courtesy lamps.
- Do the courtesy lamps continue to illuminate?
Yes
REPAIR circuit VLN33 (GY/VT) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
No
GO to E9.
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E5 CHECK THE SJB DOOR AJAR PIDs
- Enter the following diagnostic mode on the scan tool: SJB DataLogger.
- Monitor the SJB door ajar switch PIDs (D_DR_SW, P_DR_SW, LRDR_SW and RRDR_SW) while opening and closing all the doors.
- Do all the door ajar switch PID values agree with the door positions?
Yes
GO to E9.
No
GO to E6.
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E6 CHECK THE DOOR AJAR INPUT CIRCUITS FOR VOLTAGE
- Ignition OFF.
- Disconnect: Suspect Door Ajar Switch.
- Measure the voltage between the suspect door ajar switch, harness side and ground as follows:
- Is the voltage greater than 10 volts?
Yes
GO to E8.
No
GO to E7.
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E7 CHECK THE DOOR AJAR SWITCH INPUT CIRCUIT FOR AN OPEN
- Disconnect: SJB C2280c.
- Measure the resistance between the suspect door ajar switch, harness side and the SJB, harness side as follows:
- Is the resistance less than 5 ohms?
Yes
GO to E9.
No
REPAIR the circuit in question for an open. CLEAR the DTCs. REPEAT the self-test.
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E8 CHECK FOR VOLTAGE TO THE DOOR AJAR SWITCH USING THE CONNECTOR GROUND CIRCUIT
- Measure the voltage between the suspect door ajar switch pins, harness side as follows:
- Is the voltage greater than 10 volts?
Yes
INSTALL a new door latch for the ajar switch in question. REFER to Handles, Locks, Latches and Entry Systems Front Door Latch or Rear Door Latch. 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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E9 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
- corrosion
- pushed-out pins
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and determine if 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.
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