B2477

CIRCUIT DESCRIPTION
The underhood fuse block supplies battery positive voltage to the REVERSE relay coil. The BCM provides ground to the REVERSE relay in the control circuit. The BCM monitors the voltage in the REVERSE relay control circuit every 1000 ms.

CONDITIONS FOR RUNNING THE DTC
A short to ground in the control circuit of the REVERSE relay will be tested when the following conditions are met:
^ The ignition is ON.
^ The REVERSE relay is de-energized.
^ DTC B1982, and B1983 are not present.

CONDITIONS FOR SETTING THE DTC
The DTC will set when the REVERSE relay is de-energized, and the BCM detects that the control circuit of the REVERSE relay is low for at least 2 seconds.

ACTION TAKEN WHEN THE DTC SETS
The BCM turns OFF the REVERSE relay output, until the fault is no longer present.

CONDITIONS FOR CLEARING THE DTC
The DTC will clear when the BCM detects that the control circuit of the REVERSE relay is no longer low for at least 2 seconds.

TEST DESCRIPTION

Step 1-13:

The number(s) below refer to the step number(s) on the diagnostic table.
2. Listen for an audible click when the REVERSE relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
3. Tests for voltage at the coil side of the REVERSE relay. The underhood fuse block supplies battery positive voltage to the REVERSE relay coil.
4. Verifies that the BCM is providing ground to the REVERSE relay.
5. Tests if ground is constantly being applied to the REVERSE relay.