Pinpoint Test H: The Ambient Lighting Does Not Cycle Through All Color Variations (Single LED Or Zone)

Interior Lighting

Pinpoint Test H: The Ambient Lighting Does Not Cycle Through All Color Variations (Single LED or Zone)

Refer to Wiring Diagram Set 89, Interior Lamps for schematic and connector information [1][2]Diagrams By Number.

Normal Operation

The Body Control Module B (BCM-B) supplies voltage and ground to the LEDs located in the floor console cup holders, console storage bin, driver and passenger scuff plates, both door map pockets and the front and rear footwells. The message center is used to cycle through the color combinations or to turn the ambient lighting feature off. There are 3 different color (red, blue and green) LEDs housed within each LED assembly.

The BCM-B (Body Control Module B) has a built-in self-test that cycles through red, green and blue colors for each zone separately. Using this test may help diagnose a single color failure.





This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Ambient lighting harness

- BCM-B (Body Control Module B)

PINPOINT TEST H : THE AMBIENT LIGHTING DOES NOT CYCLE THROUGH ALL COLOR VARIATIONS (SINGLE LED OR ZONE)

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

H1 CHECK THE BCM-B (Body Control Module B) AMBIENT LIGHTING SWITCH PIDs

- Ignition ON.

- Place the headlamp switch in the PARKING LAMPS ON position.

Is the concern with an individual lamp?

Yes
For an individual floor console lamp, REPAIR or INSTALL a new ambient lighting harness. TEST the system for normal operation.

For all other lamps, GO to H4.

No
If all floor console lamps are the concern, GO to H4.

If a independent zone is the concern, GO to H2.

H2 CHECK THE AMBIENT LIGHTING HARNESS

- Ignition OFF.

- Place the headlamp switch in the OFF position.

- Disconnect: BCM-B (Body Control Module B) C4368A.

- Disconnect: BCM-B (Body Control Module B) C4368B.

- Check the diode circuits between the BCM-B (Body Control Module B) , harness side as follows:

Connector-Pin/Circuit Connector-Pin/Circuit Zone 1C4368B-11 CLN44 (OG) C4368A-24 RLN44 (BN) C4368B-12 CLN45 (GN) C4368A-24 RLN44 (BN) C4368B-13 CLN46 (BU) C4368A-24 RLN44 (BN) Zone 2C4368B-24 CLN48 (YE/OG) C4368A-24 RLN44 (BN) C4368B-25 CLN49 (YE/GN) C4368A-24 RLN44 (BN) C4368B-26 CLN50 (YE/BU) C4368A-24 RLN44 (BN) Zone 3C4368B-9 CLN51 (WH/OG) C4368A-24 RLN44 (BN) C4368B-10 CLN52 (WH/GN) C4368A-24 RLN44 (BN) C4368B-23 CLN53 (WH/BU) C4368A-24 RLN44 (BN)






Does the meter indicate the circuits are good?

Yes
GO to H3.

No
REPAIR the ambient lighting output circuit in question for an open. TEST the system for normal operation.

H3 CHECK THE AMBIENT LIGHTING OUTPUT CIRCUITS FOR A SHORT TO GROUND

- Measure the resistance between BCM-B (Body Control Module B) C4368B, harness side and ground as follows:

Connector-Pin Circuit Zone 1C4368B-11 CLN44 (OG) C4368B-12 CLN45 (GN) C4368B-13 CLN46 (BU) Zone 2C4368B-24 CLN48 (YE/OG) C4368B-25 CLN49 (YE/GN) C4368B-26 CLN50 (YE/BU) Zone 3C4368B-9 CLN51 (WH/OG) C4368B-10 CLN52 (WH/GN) C4368B-23 CLN53 (WH/BU)






Is the resistance greater than 10,000 ohms?

Yes
GO to H5.

No
REPAIR the ambient lighting output circuit in question for a short to ground. TEST the system for normal operation.

H4 CHECK THE AMBIENT LIGHTING OUTPUT CIRCUITS FOR AN OPEN

- Ignition OFF.

- Place the headlamp switch in the OFF position.

- Disconnect: BCM-B (Body Control Module B) C4368A and C4368B.

- Disconnect: Inoperative Ambient Lamp.

- Measure the resistance between BCM-B (Body Control Module B) , harness side and the inoperative ambient lamp as follows:

Suspect LED Component Connector-Pin Circuit BCM-B (Body Control Module B) Connector-Pin Zone 1LH map pocketC572-1 C572-2 C572-3 C572-4 CLN44 (OG) RLN44 (BN) CLN45 (GN) CLN46 (BU) C4368B-11 C4368A-24 C4368B-12 C4368B-13 RH map pocketC672-1 C672-2 C672-3 C672-4 CLN44 (OG) RLN44 (BN) CLN45 (GN) CLN46 (BU) C4368B-11 C4368A-24 C4368B-12 C4368B-13 Zone 2LH footwell lampC248-1 C248-2 C248-3 C248-4 CLN48 (YE/OG) RLN44 (BN) CLN49 (YE/GN) CLN50 (YE/BU) C4368B-24 C4368A-24 C4368B-25 C4368B-26 RH footwell lampC238-1 C238-2 C238-3 C238-4 CLN48 (YE/OG) RLN44 (BN) CLN49 (YE/GN) CLN50 (YE/BU) C4368B-24 C4368A-24 C4368B-25 C4368B-26 Center consoleC3349-1 C3349-2 C3349-3 C3349-4 CLN48 (YE/OG) RLN44 (BN) CLN49 (YE/GN) CLN50 (YE/BU) C4368B-24 C4368A-24 C4368B-25 C4368B-26 Zone 3LH scuff plateC3369-1 C3369-2 C3369-3 C3369-4 CLN53 (WH/BU) CLN52 (WH/GN) CLN51 (WH/OG) RLN44 (BN) C4368B-23 C4368B-10 C4368B-9 C4368A-24 RH scuff plateC3370-1 C3370-2 C3370-3 C3370-4 CLN53 (WH/BU) CLN52 (WH/GN) CLN51 (WH/OG) RLN44 (BN) C4368B-23 C4368B-10 C4368B-9 C4368A-24






Are the resistances less than 5 ohms?

Yes
REPAIR or INSTALL a new ambient lighting harness in question. TEST the system for normal operation.

No
REPAIR the circuit in question for an open. TEST the system for normal operation.

H5 CHECK FOR CORRECT BCM-B (Body Control Module B) OPERATION

- Disconnect the BCM-B (Body Control Module B) connector.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect the BCM-B (Body Control Module B) 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 BCM-B (Body Control Module B). 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.