Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Remote vehicle start (RVS) begins as an RF message received by the remote control door lock receiver (RCDLR) from a keyless entry transmitter. The RVS request is sent by the RCDLR to the body control module (BCM) via serial data. The BCM monitors system conditions such as content theft deterrent (CTD), hood ajar status, and body DTCs to determine if an RVS even will occur. If conditions are determined to be acceptable, the RVS message is sent to the engine control module (ECM). The ECM monitors system conditions such as engine control parameters and vehicle theft deterrent (VTD) to determine if engine starting will be allowed. If conditions are acceptable, the ECM will initiate engine starting. During the engine run time in a RVS attempt, before the operator enters the vehicle, the ECM may discontinue engine operation if system conditions require it or a message is received from the BCM requesting the engine be turned OFF.

The RVS system will not operate if any of the following conditions are present:

Schematic Reference

Starting and Charging Schematics

Connector End View Reference

Engine Electrical Connector End Views

Description and Operation

Keyless Entry System Description and Operation

Electrical Information Reference

Scan Tool Reference

1. Verify that RVS is enabled in the vehicle driver information center (DIC).

⇒	If RVS is not enabled, use the DIC to turn on RVS functionality.

2. Verify that the keyless entry functions operate with all available keyless entry transmitters.

⇒	If the keyless entry system does not function properly with all available transmitters, refer to Keyless Entry System Inoperative .

3. With the hood closed, verify the scan tool Hood Ajar Switch parameter is Closed.

⇒	If not the specified value, refer to Hood Ajar Switch Malfunction.

4. Verify no RVS disabling parameters are current as outlined in Diagnostic Aids.

⇒	If any RVS disablers are current, refer to the appropriate subsection diagnostics.

Hood Ajar Switch Malfunction

1. Ignition OFF, disconnect the harness connector at the hood ajar switch.
2. Ignition OFF, test for less than 1.0 ohm of resistance between the ground circuit terminal B and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify the scan tool Hood Ajar Switch Parameter is Open.

⇒	If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the BCM.

4. Install a 3 A fused jumper wire between the signal circuit terminal A and ground. Verify the scan tool Hood Ajar Switch Parameter is Closed.

⇒	If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

5. If all circuits test normal, replace the hood ajar switch.

Hood Ajar Switch

1. Ignition OFF, disconnect the harness connector at the hood ajar switch.
2. Test for infinite resistance between the signal circuit terminal A and the ground circuit terminal B with the switch in the open position.

⇒	If not the specified value, replace the hood ajar switch.

3. Test for less than 2.0 ohms of resistance between the signal circuit terminal A and the ground circuit terminal B with the switch in the closed position.

⇒	If greater than the specified range, replace the hood ajar switch.

4. Test for infinite resistance between each terminal and the hood ajar switch housing.

⇒	If not the specified value, replace the hood ajar switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM replacement, setup, and programming