Pinpoint Test H: The Ambient Lighting Is Inoperative
Interior Lighting
Pinpoint Tests
Pinpoint Test H: The Ambient Lighting Is Inoperative
Refer to Wiring Diagram Set 89, Interior Lamps for schematic and connector information. Diagrams By Number
Normal Operation
When the ignition key is in the ACC or RUN position, the ambient lighting module supplies voltage and ground to the ambient lighting LEDs. The ambient lighting switch is used to cycle through the 7 color combinations or to turn the ambient lighting feature off.
When the ignition key is in the ACC or RUN position, the ambient lighting switch and the ambient lighting module receive voltage. 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.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals, or connectors
- Ambient lighting switch
- Ambient lighting harness
- Ambient lighting module
- Smart Junction Box (SJB)
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.
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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 H3.
No
VERIFY the SJB fuse 41 (15A) is OK.
If OK, GO to H2.
If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. Diagrams By Number
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H2 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 SJB C2280a-7, circuit CBP41 (BU), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to H10.
No
REPAIR circuit CBX07 (GN/RD) or circuit CBP41 (BU) for an open. TEST the system for normal operation.
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H3 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 H4.
No
If voltage is always present, GO to H5.
If no voltage is present, GO to H6.
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H4 CHECK FOR VOLTAGE TO THE AMBIENT LIGHTING MODULE USING THE CONNECTOR GROUND
- 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 H8.
No
REPAIR circuit GD908 (BK) or circuit GD138 (BK/WH) for an open. TEST the system for normal operation.
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H5 CHECK THE AMBIENT LIGHTING SWITCH OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: Ambient Lighting Switch C280.
- 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 CLN12 (YE) or circuit CLN54 (BN/YE) for a short to voltage. TEST the system for normal operation.
No
INSTALL a new ambient lighting switch. REFER to Passenger Air Bag Deactivation (PAD) Indicator in Supplemental Restraint System Service and Repair. TEST the system for normal operation.
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H6 CHECK FOR VOLTAGE TO THE AMBIENT LIGHTING SWITCH
- Ignition OFF.
- Connect: Ambient Lighting Module C3347.
- Disconnect: Ambient Lighting Switch C280.
- Ignition ON.
- Measure the voltage between the ambient lighting switch C280-4, circuit CBP41 (BU), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to H7.
No
REPAIR circuit CBP41 (BU) for an open. TEST the system for normal operation.
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H7 CHECK THE AMBIENT LIGHTING SWITCH
- Connect and remove a fused jumper wire between the ambient lighting switch C280-4, circuit CBP41 (BU), harness side and the ambient lighting switch C280-5, circuit CLN12 (YE), 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 PAD Indicator in Supplemental Restraint System Service and Repair. TEST the system for normal operation.
No
REMOVE the jumper wire. REPAIR circuit CLN12 (YE)/CLN54 (BN/YE) for an open. TEST the system for normal operation.
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H8 CHECK THE AMBIENT LIGHTING HARNESS
- Ignition OFF.
- Check any of the diode circuits between the ambient lighting module, harness side as follows:
- Does the meter indicate the circuit is good?
Yes
GO to H9.
No
REPAIR or INSTALL a new ambient lighting harness. TEST the system for normal operation.
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H9 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.
If the concern is still present, INSTALL the original ambient lighting module. INSTALL a new ambient lighting harness. 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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H10 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 Multifunction Electronic Modules 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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