Pinpoint Test D: The Courtesy Lamps Stay On Continuously
Interior Lighting
Pinpoint Tests
Pinpoint Test D: The Courtesy Lamps Stay On Continuously
Refer to Wiring Diagram Set 89, Interior Lamps for schematic and connector information. Diagrams By Number
Normal Operation
When a door is opened, the door ajar input from circuit 1312 (LG/BK) or circuit 1314 (YE/GN) to the Smart Junction Box (SJB) opens. When the SJB identifies that the circuit is open, the SJB provides voltage and ground to the courtesy lamps through circuits 53 (BK/LB) and 54 (LG/YE). The door ajar switches are grounded through circuit 1205 (BK).
When the instrument panel dimmer switch is rotated to the interior lamps ON position, the SJB receives a signal through circuit 2085 (VT/YE), requesting the courtesy lamps.
- DTC B1319 (Driver Door Ajar Circuit Failure) - an on-demand DTC that sets when the SJB detects an open on the driver door ajar switch circuit.
- DTC B1327 (Passenger Door Ajar Circuit Failure) - an on-demand DTC that sets when the SJB detects an open on the passenger door ajar switch circuit.
- DTC B2254 (The Courtesy Lamp Ground Control Circuit Failure) - an on-demand DTC that sets when the SJB detects a short to ground on the courtesy lamp ground control circuit.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Door ajar switch
- Instrument panel dimmer switch
- SJB
PINPOINT TEST D: 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 THE RECORDED DTCs FROM THE SJB SELF-TEST
- Check the recorded results from the SJB self-test.
- Is DTC B1319 or B1327 present?
Yes
GO to D2.
No
GO to D5.
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D2 CHECK THE AJAR SIGNAL CIRCUIT FOR GROUND
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Disconnect: SJB C2280e.
- NOTE: Make sure the doors are closed.
- Measure the resistance between the SJB, harness side and ground as follows:
B1319-B1327:
- Is the resistance less than 5 ohms?
Yes
GO to D9.
No
GO to D3.
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D3 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
- Disconnect: Suspect Door Ajar Switch.
- Measure the resistance between the suspect door ajar switch, harness side and ground as follows:
B1319-B1327:
- Is the resistance less than 5 ohms?
Yes
GO to D4.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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D4 CHECK THE DOOR AJAR SIGNAL CIRCUIT FOR AN OPEN
- Measure the resistance between the suspect door ajar switch, harness side and the SJB, harness side as follows:
B1319-B1327:
- Is the resistance less than 5 ohms?
Yes
INSTALL a new ajar switch in question. CLEAR the DTCs. REPEAT the self-test.
No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
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D5 CHECK THE INSTRUMENT PANEL DIMMER SWITCH
- Ignition OFF.
- Disconnect: Instrument Panel Dimmer Switch C2298.
- Do the courtesy lamps turn off?
Yes
INSTALL a new instrument panel dimmer switch. TEST the system for normal operation.
No
GO to D6.
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D6 CHECK CIRCUIT 2085 (VT/YE) FOR A SHORT TO GROUND
- Disconnect: SJB C2280b.
- Measure the resistance between the instrument panel dimmer switch C2298-5, circuit 2085 (VT/YE), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to D7.
No
REPAIR the circuit. TEST the system for normal operation.
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D7 CHECK THE DOME LAMP CONTROL GROUND CIRCUIT FOR A SHORT TO GROUND
- Disconnect: SJB C2280f.
- Measure the resistance between the SJB C2280f-25, circuit 54 (LG/YE), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to D9.
No
GO to D8.
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D8 CHECK CIRCUIT 54 (LG/YE) FOR A SHORT TO GROUND
- Disconnect: Overhead Console C930 (Without Convertible Top).
- Disconnect: Overhead Console C9013 (With Convertible Top).
- Measure the resistance between the SJB C2280f-25, circuit 54 (LG/YE), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
INSTALL a new overhead console. TEST the system for normal operation.
No
REPAIR the circuit. 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. 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. TEST the system for normal operation.
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