Pinpoint Test A: The Courtesy Lamps Do Not Illuminate With A Door Open
Interior Lighting
Pinpoint Tests
Pinpoint Test A: The Courtesy Lamps Do Not Illuminate With A Door Open
Refer to Wiring Diagram Set 110, Power Door Locks for schematic and connector information. Diagrams By Number
Normal Operation
The Smart Junction Box (SJB) (vehicles without Intelligent Access (IA)) or the Remote Function Actuator (RFA) module (vehicles with IA) send 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 or the RFA module.
For vehicles with IA, the RFA module then sends a door ajar message to the SJB over the communication network.
When the SJB detects an open door, the SJB provides voltage to the courtesy lamps.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Door ajar switch
- SJB
- RFA module
PINPOINT TEST A: THE COURTESY LAMPS DO NOT ILLUMINATE 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.
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A1 CHECK THE COURTESY LAMP OPERATION USING THE INSTRUMENT PANEL DIMMER SWITCH
- Operate the courtesy lamps using the instrument panel dimmer switch.
- Do the interior courtesy lamps illuminate using the instrument panel dimmer switch?
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 DOOR AJAR SWITCH OPERATION
- Ignition OFF.
- Disconnect: Suspect Door Latch .
- Do the interior lamps illuminate?
Yes
INSTALL a new door latch in question. REFER to Doors, Hood and Trunk &/or Locks. TEST the system for normal operation.
No
GO to A3.
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A3 CHECK THE AJAR SWITCH CIRCUIT FOR A SHORT TO GROUND
- Disconnect: SJB C2280c (Vehicles Without IA)
or RFA Module C2153e (Vehicles With IA) .
- Measure the resistance between the suspect door latch, harness side and ground as follows:
- Is the resistance greater than 10,000 ohms?
Yes
For vehicles without IA, GO to A4.
For vehicles with IA, GO to A5.
No
REPAIR the circuit in question for a short to ground. TEST the system for normal operation.
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A4 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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A5 CHECK FOR CORRECT RFA MODULE OPERATION
- Disconnect all the RFA module connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the RFA module 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 RFA module. 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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