Pinpoint Test B: The Control Illumination Is Inoperative/Always On

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

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

B1 DETERMINE THE CONDITION
- Key in OFF position.
- Open the driver front door.
- Observe the door lock control switch.
- Is the door lock control switch illuminated?
Yes : GO to B2.

No : GO to B3.
B2 CHECK CIRCUIT 170 (RD/LB) FOR A SHORT TO VOLTAGE
- Disconnect: SJB C2280c.
- Observe the door lock control switch.
- Is the door lock control switch illuminated?
Yes : REPAIR the circuit. TEST the system for normal operation.

No : GO to B7.
B3 CHECK THE DIMMABLE BACKLIGHTING COMPONENTS
- Key in ON position.
- Observe all the dimmable backlighting components.
- Are all the dimmable backlighting components illuminated?
Yes : GO to B5.

No : GO to B4.
B4 CHECK CIRCUIT 19 (LB/RD) FOR AN OPEN
- Key in OFF position.
- Disconnect: Instrument Cluster C220.
- Connect a fused (5A) jumper wire between the instrument cluster C220-26, circuit 19 (LB/RD), harness side and the instrument cluster C220-28, circuit 1002 (BK/PK), harness side.
- Key in ON position.
- Do the illumination components illuminate?
Yes : GO to B6.

No : REPAIR the circuit. TEST the system for normal operation.
B5 CHECK CIRCUIT 19 (LB/RD) FOR A SHORT TO VOLTAGE
- Disconnect: Instrument Cluster C220.
- Observe all the dimmable backlighting components.
- Are all the dimmable backlighting components illuminated?
Yes : REPAIR the circuit. TEST the system for normal operation.

No : GO to B6.
B6 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
- Disconnect all the instrument cluster connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all the instrument cluster 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 instrument cluster. REFER to INSTRUMENT CLUSTER . REPEAT the self-test.

No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
B7 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
  - corrosion
  - 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 . REPEAT the self-test.

No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.