Pinpoint Test H: The Ambient Lighting Is Inoperative
Interior Lighting
Pinpoint Test H: The Ambient Lighting Is Inoperative
Refer to Wiring Diagram Set 89, Interior Lamps for schematic and connector information Electrical Diagrams.
Normal Operation
When the ignition is in any state other than OFF, the Body Control Module (BCM) supplies voltage to the ambient lighting module and the ambient lighting switch. The ambient lighting module supplies voltage and ground to the ambient lighting LEDs. The ambient lighting switch cycles through the 7 color combinations or turns the ambient lighting feature off.
When the ambient lighting switch is pressed, voltage is routed to the ambient lighting module, indicating a request for the module to cycle the ambient lighting to the next setting.
The ambient lighting switch is a momentary contact switch.
- DTC B12F1:11 (Ambient Lighting Zone 1 Output: Circuit Short To Ground)- a continuous and on-demand DTC that sets when the BCM (Body Control Module) detects a short to ground from the ambient lighting module voltage supply circuit.
- DTC B12F1:15 (Ambient Lighting Zone 1 Output: Circuit Short To Battery Or Open)- a continuous and on-demand DTC that sets when the BCM (Body Control Module) detects an open from the ambient lighting module voltage supply circuit.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals, or connectors
- Ambient lighting switch
- Ambient lighting harness
- Ambient lighting module
- BCM (Body Control Module)
PINPOINT TEST H : 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.
H1 CHECK FOR VOLTAGE TO THE AMBIENT LIGHTING MODULE
- Ignition OFF.
- Disconnect: Ambient Lighting Module C3347.
- Ignition ON.
- Measure the voltage between the ambient lighting module C3347-1, circuit CBX07 (GN/RD), harness side and ground.
Is the voltage greater than 10 volts?
Yes
GO to H4.
No
GO to H2.
H2 CHECK THE AMBIENT LIGHTING MODULE VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: BCM (Body Control Module) C2280E.
- Measure the resistance between the ambient lighting module C3347-1, circuit CBX07 (GN/RD), harness side and ground.
Is the resistance greater than 10,000 ohms?
Yes
GO to H3.
No
REPAIR circuit CLN02 (VT/BN) for a short to ground. CYCLE the ignition ON and then OFF. CLEAR the DTCs. TEST the system for normal operation.
H3 CHECK THE AMBIENT LIGHTING MODULE VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
- Measure the resistance between the ambient lighting module C3347-1, circuit CBX07 (GN/RD), harness side and the BCM (Body Control Module) C2280E-24, circuit CLN02 (VT/BN), harness side.
Is the resistance less than 5 ohms?
Yes
GO to H11.
No
REPAIR circuit CBX07 (GN/RD) or circuit CLN02 (VT/BN) for an open. TEST the system for normal operation.
H4 CHECK THE AMBIENT LIGHTING SWITCH OUTPUT CIRCUIT
- While pressing and releasing the ambient lighting switch, measure the voltage between the ambient lighting module C3347-2, 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 H5.
No
If voltage is always present, GO to H7.
If no voltage is present, GO to H8.
H5 CHECK THE AMBIENT LIGHTING MODULE GROUND CIRCUIT FOR AN OPEN
- Measure the voltage between the ambient lighting module C3347-1, circuit CBX07 (GN/RD), harness side and the ambient lighting module C3347-8, circuit GD908 (BK), harness side.
Is the voltage greater than 10 volts?
Yes
GO to H6.
No
REPAIR circuit GD908 (BK) or circuit GD115 (BK/GY) for an open. TEST the system for normal operation.
H6 CHECK THE AMBIENT LIGHTING HARNESS
- Ignition OFF.
- Check any of the diode circuits between the ambient lighting module, harness side as follows:
Connector-Pin Circuit Connector-Pin Circuit C3347-5 CLN45 (GN) C3347-4 RLN44 (BN) C3347-6 CLN46 (BU) C3347-4 RLN44 (BN) C3347-7 CLN44 (OG) C3347-4 RLN44 (BN)
Does the meter indicate the circuit is good?
Yes
GO to H10.
No
REPAIR or INSTALL a new ambient lighting harness. TEST the system for normal operation.
H7 CHECK THE AMBIENT LIGHTING SWITCH OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: Ambient Lighting Switch C2401.
- Ignition ON.
- Measure the voltage between the ambient lighting module C3347-2, circuit CLN54 (BN/YE), harness side and ground.
Is any voltage present?
Yes
REPAIR circuit CLN54 (BN/YE) or circuit CLN60 (WH/BN) for a short to voltage. 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.
H8 CHECK FOR VOLTAGE TO THE AMBIENT LIGHTING SWITCH
- Ignition OFF.
- Connect: Ambient Lighting Module C3347.
- Disconnect: Ambient Lighting Switch C2401.
- Ignition ON.
- Measure the voltage between the ambient lighting switch C2401-2, circuit CLN02 (VT/BN), harness side and ground.
Is the voltage greater than 10 volts?
Yes
GO to H9.
No
REPAIR circuit CLN02 (VT/BN) for an open. TEST the system for normal operation.
H9 BYPASS THE AMBIENT LIGHTING SWITCH
- Connect and remove a fused jumper wire between the ambient lighting switch C2401-2, circuit CLN02 (VT/BN), harness side and the ambient lighting switch C2401-1, circuit CLN60 (WH/BN), harness side.
Do the ambient LEDs illuminate and cycle through a color change each time the jumper wire is connected and removed?
Yes
REMOVE the jumper wire. INSTALL a new ambient lighting switch. REFER to Ambient Lighting Switch Service and Repair. TEST the system for normal operation.
No
REMOVE the jumper wire. REPAIR circuit CLN54 (BN/YE) or circuit CLN60 (WH/BN) for an open. TEST the system for normal operation.
H10 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.
H11 CHECK FOR CORRECT BCM (Body Control Module) OPERATION
- Disconnect all the BCM (Body Control Module) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the BCM (Body Control 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 BCM (Body Control Module). 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.