Pinpoint Test A: The Courtesy Lamps Do Not Turn On With A Door Open
Interior Lighting
Pinpoint Tests
Pinpoint Test A: The Courtesy Lamps Do Not Turn On With A Door Open
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
When any door is open, the ajar switch opens the circuit to the Smart Junction Box (SJB). The SJB monitors the ajar circuits, and based on the ajar status, supplies voltage to the courtesy lamps.
The SJB also sends a voltage reference signal to the instrument panel dimmer switch to monitor the dome defeat input request. When the instrument panel dimmer switch is in the DOME DEFEAT position, the signal is routed to ground indicating a request for the dome defeat feature.
When any door is opened, a correct unlock code from the keyless entry keypad or an unlock request from a programmed Remote Keyless Entry (RKE) transmitter is detected, the SJB provides voltage to the courtesy lamps unless the dome defeat from the instrument panel dimmer switch is detected.
NOTE: All the door ajar switches are integral to the door latch except for the rear door ajar switches on SuperCab vehicles. The rear door ajar switches on SuperCab vehicles can be replaced independently of the door latch.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Door ajar switch
- Instrument panel dimmer switch
- SJB
PINPOINT TEST A: THE COURTESY LAMPS DO NOT TURN ON WITH A DOOR OPEN
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Make sure the instrument panel dimmer switch is not in the DOME DEFEAT position before continuing diagnostics.
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A1 CHECK THE OPERATION OF ALL THE INTERIOR COURTESY LAMPS
- Ignition OFF.
- Rotate the instrument panel dimmer switch to the DOME LAMP position and observe the interior courtesy lamps.
- Do the interior courtesy lamps illuminate?
Yes
GO to A2.
No
GO to Pinpoint Test C. Pinpoint Test C: The Interior Courtesy Lamp(s) Are Inoperative
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A2 CHECK THE INSTRUMENT PANEL DIMMER SWITCH PID
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: SJB DataLogger .
- NOTE: The DOME_DEF PID should indicate All if the switch is in the DOME DEFEAT position and Undefined if it is not.
- Monitor the SJB instrument panel dimmer switch PID (DOME_DEF).
- Does the PID indicate Undefined?
Yes
GO to A5.
No
GO to A3.
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A3 CHECK THE INSTRUMENT PANEL DIMMER SWITCH
- Disconnect: Instrument Panel Dimmer Switch C2298 .
- Enter the following diagnostic mode on the scan tool: SJB DataLogger .
- Monitor the SJB instrument panel dimmer switch PID (DOME_DEF).
- Does the PID indicate Undefined?
Yes
INSTALL a new instrument panel dimmer switch. REFER to Instrument Panel, Gauges and Warning Indicators. TEST the system for normal operation.
No
GO to A4.
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A4 CHECK THE DOME DEFEAT INPUT CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: SJB C2280b .
- Measure the resistance between the instrument panel dimmer switch C2298-3, circuit CLN27 (WH/BN), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to A8.
No
REPAIR circuit CLN27 (WH/BN) for a short to ground. TEST the system for normal operation.
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A5 CHECK THE DOOR AJAR PIDs
- Enter the following diagnostic mode on the scan tool: SJB DataLogger .
- Check 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 A8.
No
GO to A6.
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A6 CHECK THE DOOR AJAR SWITCH OPERATION
- Disconnect: Suspect Door Latch or Ajar Switch .
- Do the courtesy lamps illuminate?
Yes
INSTALL a new door latch or ajar switch in question. REFER to Doors, Hood and Trunk &/or Locks. TEST the system for normal operation.
No
GO to A7.
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A7 CHECK THE DOOR AJAR INPUT CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: SJB C2280c .
- For any door except a rear door on SuperCab vehicles, measure the resistance between the suspect door latch, harness side and ground as follows:
- For a rear door on SuperCab vehicles, measure the resistance between the suspect door ajar switch, harness side and ground as follows:
- Is the resistance greater than 10,000 ohms?
Yes
GO to A8.
No
REPAIR the circuit in question for a short to ground. TEST the system for normal operation.
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A8 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.
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