Inspection and Verification
WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
- Verify the customer concern.
- Visually inspect for obvious signs of mechanical or electrical damage.VISUAL INSPECTION CHART
Mechanical Electrical - Window regulator assembly
- Window glass
- Rear window defrost grid
- Smart junction box (SJB) circuit breaker
- 47 (30A)
- Battery junction box (BJB) fuse(s):
- 2 (30A)
- 35 (10A)
- Rear window defrost relay
- Accessory delay relay
- Window motor
- Window control switch
- Circuitry
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- If the cause is not visually evident, connect the scan tool to the data link connector (DLC).
- If the scan tool does not communicate with the VCM:
- check the VCM connection to the vehicle.
- check the scan tool connection to the VCM.
- refer to MODULE COMMUNICATIONS NETWORK article. No Power To The Scan Tool, to diagnose no communication with the scan tool.
- If the scan tool does not communicate with the vehicle:
- verify the ignition key is in the ON position.
- verify the scan tool operation with a known good vehicle.
- refer to MODULE COMMUNICATIONS NETWORK article to diagnose no response from the smart junction box (SJB) or HVAC module.
- Carry out the network test.
- If the scan tool responds with no communication from one or more modules, refer to MODULE COMMUNICATIONS NETWORK article.
- If the network test passes, retrieve and record the continuous memory DTCs.
- Clear the continuous DTCs and carry out the self-test diagnostics for the SJB or HVAC module.
- If the DTCs retrieved are related to the concern, go to the Smart Junction Box (SJB) DTC Chart or Heating Ventilation Air Conditioning (HVAC) Module DTC Chart. For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES article.
- If no DTCs related to the concern are retrieved, go to Symptom Chart .
NOTE:
Make sure to use the latest scan tool software release.
NOTE:
The vehicle communication module (VCM) LED prove-out confirms power and ground from the data link connector (DLC) are provided to the VCM.
SMART JUNCTION BOX (SJB) DTC CHART
| DTC | Description | Action |
|---|---|---|
| B1302 | Accessory Delay Relay Coil Circuit Failure | Go to Pinpoint Test I . |
| B1304 | Accessory Delay Relay Coil Circuit Short to Battery | If the accessory delay is always on, go to Pinpoint Test H . If the accessory delay is inoperative, go to Pinpoint Test I . |
For a complete list of SJB DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES article.
HEATING VENTILATION AIR CONDITIONING (HVAC) MODULE DTC CHART
| DTC | Description | Action |
|---|---|---|
| B12BE | Heated Backlight/Mirror Relay Drive Circuit Shorted to Battery Voltage | If the rear window does not defrost, go to Pinpoint Test F . If the rear window defrost does not turn off, go to Pinpoint Test G . |
| B12BF | Heated Backlight/Mirror Relay Drive Circuit Open or Shorted to Ground | Go to Pinpoint Test F . |
For a complete list of HVAC module DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES article.