Circuit Description
The body control module (BCM) controls some retained accessory power (RAP) functions through the RAP supply voltage circuit. When the ignition switch is in either the ACC or the ON position, the BCM provides battery voltage to the RAP supply voltage circuit.
When the ignition switch turns from ON or ACC to OFF, with all of the vehicle doors closed, the BCM still provides battery voltage to the circuit for 10 minutes, or until any vehicle door opens.
Conditions for Running the DTC
The system voltage must be between 9-16 volts.
Conditions for Setting the DTC
| • | The BCM detects a short to ground in the RAP supply voltage circuit when the BCM is trying to energize the circuit. |
| • | The condition above must be present for more than 1 second. |
Action Taken When the DTC Sets
| • | The BCM stores DTC B1477 in memory. |
| • | The devices powered by the RAP supply voltage circuit will not operate. |
Conditions for Clearing the DTC
| • | A current DTC clears when the malfunction is no longer present. |
| • | A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction. |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Retained Accessory Power (RAP) Schematics Connector End View Reference: Master Electrical Component List in Wiring Systems | |||
1 | Did you perform the retained accessory power (RAP) Diagnostic System Check? | Go to Step 2 | |
2 |
Does the DTC B1477 still set as current? | Go to Step 3 | Go to Step 4 |
3 | Test the RAP supply voltage circuit for a short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 8 | Go to Step 5 |
4 | Inspect for poor connections at the first device powered by RAP supply voltage circuit - RAP relay or sunroof/power roof module. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 8 | Go to Step 6 |
5 | Inspect for poor connections at the harness connector of the BCM . Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 8 | Go to Step 7 |
6 | Replace the first device powered by RAP supply voltage circuit - RAP relay or sunroof/power roof module. Did you complete the replacement? | Go to Step 8 | -- |
7 |
Important: Perform the module setup procedure, if required.
Did you complete the replacement? | Go to Step 8 | -- |
8 |
Does the DTC reset? | Go to Step 2 | System OK |
