Pinpoint Test J: The Ambient Lighting Is Inoperative
Interior Lighting
Pinpoint Tests
Pinpoint Test J: The Ambient Lighting Is Inoperative
Refer to Wiring Diagram Set 89, Interior Lamps for schematic and connector information. Diagrams By Number
Normal Operation
The ambient lighting module and switch receive voltage from the accessory delay relay on circuit CBX07 (GN/RD), which is circuit CBP02 (GN) at the Smart Junction Box (SJB). The ambient lighting module supplies voltage and ground to the LEDs, located in the floor console. The ambient lighting switch can cycle through 7 color combinations or turn the ambient lighting off by sending a voltage signal to the ambient lighting module through circuit CLN54 (BN/YE). There are 3 different color LEDs (red, blue, and green) housed within each LED assembly. Ground is provided to the module and switch through circuit GD116 (BK/VT), which is circuit GD908 (BK) at the module and switch.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Ambient lighting switch
- Ambient lighting module
PINPOINT TEST J: THE AMBIENT LIGHTING IS INOPERATIVE
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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J1 CHECK CIRCUIT CBP02 (GN)/CBX07 (GN/RD) FOR AN OPEN (TO AMBIENT LIGHTING MODULE)
- Ignition OFF.
- Disconnect: Ambient Lighting Module C3251.
- Ignition ON.
- Measure the voltage between the ambient lighting module C3251-1, circuit CBX07 (GN/RD), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to J2.
No
REPAIR circuit CBX07 (GN/RD) or CBP02 (GN). TEST the system for normal operation.
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J2 CHECK THE INPUT FROM CIRCUIT CLN54 (BN/YE)
- While pressing and releasing the ambient lighting switch, measure the voltage between the ambient lighting module C3251-2, circuit CLN54 (BN/YE), harness side and ground.
- Is the voltage greater than 10 volts with the switch pressed, and 0 volts with the switch released?
Yes
GO to J3.
No
If voltage is always present, GO to J4.
If no voltage is present, GO to J5.
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J3 CHECK CIRCUIT GD908 (BK)/GD116 (BK/VT) FOR AN OPEN
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the ambient lighting module C3251-8, circuit GD908 (BK), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to J7.
No
REPAIR circuit GD908 (BK) or GD116 (BK/VT). TEST the system for normal operation.
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J4 CHECK CIRCUIT CLN54 (BN/YE) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: Ambient Lighting Switch C3250.
- Ignition ON.
- Measure the voltage between the ambient lighting module C3251-2, circuit CLN54 (BN/YE), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit. TEST the system for normal operation.
No
INSTALL a new ambient lighting switch. REFER to Ambient Lighting Switch Service and Repair. TEST the system for normal operation.
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J5 CHECK CIRCUIT CBX07 (GN/RD) FOR AN OPEN (TO THE AMBIENT LIGHTING SWITCH)
- Disconnect: Ambient Lighting Switch C3250.
- Measure the voltage between the ambient lighting switch C3250-2, circuit CBX07 (GN/RD), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to J6.
No
REPAIR the circuit. TEST the system for normal operation.
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J6 CHECK THE AMBIENT LIGHTING SWITCH
- Connect: Ambient Lighting Module C3251.
- Connect and remove a fused jumper wire between the ambient lighting switch C3250-2, circuit CBX07 (GN/RD), harness side and the ambient lighting switch C3250-6, circuit CLN54 (BN/YE), harness side.
- Do the ambient lighting LEDs illuminate and cycle through a color change each time the jumper wire is connected and removed?
Yes
INSTALL a new ambient lighting switch. REFER to Ambient Lighting Switch Service and Repair. TEST the system for normal operation.
No
REPAIR circuit CLN54 (BN/YE) for an open. TEST the system for normal operation.
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J7 CHECK THE AMBIENT LIGHTING HARNESS
- Ignition OFF.
- Check the diode circuits between the ambient lighting module, harness side as follows:
- Does the meter indicate that each circuit is OK?
Yes
GO to J8.
No
INSTALL a new ambient lighting harness. TEST the system for normal operation.
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J8 CHECK FOR CORRECT AMBIENT LIGHTING MODULE OPERATION
- Disconnect the ambient lighting module connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the ambient lighting module connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new ambient lighting module. REFER to Ambient Lighting Module 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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