The liftgate module (LGM)/endgate module (EGM) monitors the voltage level on the supply voltage circuit of the rear window defogger. The LGM/EGM test the supply voltage circuit of the rear window defogger every 160 milliseconds. With the rear window defogger inactive, the supply voltage circuit of the rear window defogger will have no voltage present. With the rear window defogger active, the supply voltage circuit of the rear window defogger will be near system voltage.
This diagnostic procedure supports the following DTC:
DTC B0283 Electric Rear Defrost Circuit
The ignition is ON.
One of the following conditions can cause this DTC to set:
• | Battery positive voltage is detected on the supply voltage circuit of the rear window defogger, while the rear window defogger is inactive. |
• | Low voltage is detected on the supply voltage circuit of the rear window defogger, while the rear window defogger is active. |
The rear window defogger is disabled.
A history DTC will clear after 50 consecutive ignition cycles.
The DTC will clear from current status when one of the following conditions is no longer detected:
• | Battery positive voltage on the supply voltage circuit of the rear window defogger, while the rear window defogger is inactive. |
• | Low voltage on the supply voltage circuit of the rear window defogger, while the rear window defogger is active. |
Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: Defogger Schematics Connector End View Reference: Stationary Windows Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the test lamp illuminate? | Go to Step 5 | Go to Step 3 |
3 |
Does the test lamp illuminate? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 4 |
4 |
Does the test lamp illuminate? | Go to Step 7 | Go to Step 6 |
5 | Test the supply voltage circuit of the rear window defogger for a short to battery positive voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
6 | Repair the battery positive voltage circuit of the LGM/EGM for an open or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 10 | -- |
7 | Test the supply voltage circuit of the rear window defogger for a short to ground or an open. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
8 | Inspect for poor connections at the harness connector of the LGM/EGM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 9 |
9 | Replace the module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 10 | -- |
10 |
Does the DTC reset? | Go to Step 2 | System OK |