Pinpoint Test D: All The Courtesy Lamps Stay On Continuously
Interior Lighting
Pinpoint Tests
Pinpoint Test D: All The Courtesy Lamps Stay On Continuously
Refer to Wiring Diagram Set 89, Interior Lamps for schematic and connector information. Diagrams By Number
Refer to Wiring Diagram Set 117, Remote Keyless Entry and Alarm for schematic and connector information. Diagrams By Number
Normal Operation
The Smart Junction Box (SJB) sends a voltage signal to each door ajar switches. The door ajar switch is open with the door closed. When the door is opened, the signal to ground is completed, indicating an open door to the SJB.
The SJB sends a voltage signal to the instrument panel dimmer switch to determine if the courtesy lamps are requested. When the instrument panel dimmer switch is rotated to the DOME LAMP position, the signal is routed to ground indicating a request for the courtesy lamps.
When the request from the instrument panel dimmer switch is detected, any door is opened or an unlock request from a programmed Remote Keyless Entry (RKE) transmitter is detected, the SJB supplies voltage to the interior courtesy lamps.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Door ajar switch
- Instrument panel dimmer switch
- Body builder equipment
- SJB
PINPOINT TEST D: ALL 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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D1 CHECK FOR SJB OUTPUT DTCs
- Ignition OFF.
- Use the recorded results from the SJB self-test.
- Is DTC B2A35 present?
Yes
GO to D2.
No
GO to D4.
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D2 CHECK THE SJB INTERIOR COURTESY LAMP OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Disconnect: SJB C2280a.
- Ignition ON.
- Observe the interior courtesy lamps.
- Do the interior courtesy lamps continue to illuminate?
Yes
For cutaway vehicles, GO to D3.
For all other vehicle types, REPAIR circuit VLN33 (GY/VT) for a short to voltage. TEST the system for normal operation.
No
GO to D9.
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D3 ISOLATE THE SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: Body Builder C3359.
- Ignition ON.
- Observe the front interior courtesy lamp.
- Does the front interior courtesy lamp continue to illuminate?
Yes
REPAIR circuit VLN33 (GY/VT) for a short to voltage. TEST the system for normal operation.
No
The vehicle is operating correctly. REFER to the body builder manual to continue diagnosis.
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D4 CHECK THE SJB INSTRUMENT PANEL DIMMER SWITCH DOME LAMP REQUEST PID
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: SJB DataLogger.
- Monitor the SJB instrument panel dimmer switch dome lamp request PID (DOMELM_SW).
- Does the PID indicate the instrument panel dimmer switch is in the DOME LAMP position?
Yes
GO to D5.
No
GO to D7.
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D5 CHECK THE INSTRUMENT PANEL DIMMER SWITCH
- Ignition OFF.
- Disconnect: Instrument Panel Dimmer Switch C2065.
- Make sure all the doors are closed and wait 30 seconds.
- Do the courtesy lamps continue to illuminate?
Yes
GO to D6.
No
INSTALL a new instrument panel dimmer switch. REFER to Instrument Cluster and Panel Illumination Service and Repair. TEST the system for normal operation.
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D6 CHECK THE DOME LAMP REQUEST INPUT CIRCUIT FOR A SHORT TO GROUND
- Disconnect: SJB C2280b.
- Measure the resistance between the instrument panel dimmer switch C2065-2, circuit CLN28 (GN/BU), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to D9.
No
REPAIR circuit CLN28 (GN/BU) for a short to ground. TEST the system for normal operation.
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D7 CHECK THE DOOR AJAR SWITCH
- Ignition OFF.
- Disconnect: Suspect Door Ajar Switch or Body Builder Connector C3359.
- Make sure all the doors are closed and wait 30 seconds.
- Do the courtesy lamps continue to illuminate?
Yes
GO to D8.
No
For the body builder connector, the vehicle is operating correctly. REFER to the body builder manual to continue diagnosis.
For a door ajar switch, INSTALL a new door ajar switch in question. TEST the system for normal operation.
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D8 CHECK THE DOOR AJAR INPUT CIRCUIT FOR A SHORT TO GROUND
- Disconnect: SJB C2280c.
- Measure the resistance between the suspect door ajar switch or body builder connector, harness side and ground as follows:
- Is the resistance greater than 10,000 ohms?
Yes
GO to D9.
No
REPAIR the circuit in question for a short to ground. TEST the system for normal operation.
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D9 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 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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