Diagnostic Instructions
Circuit/System Description
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 event will occur. If conditions are determined to be acceptable, the RVS message is sent to the engine control module (ECM)/powertrain control module (PCM).
The ECM/PCM 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/PCM will initiate engine starting. During the engine run time in
a RVS attempt, before the operator enters the vehicle, the ECM/PCM may discontinue engine operation if system conditions require it or a message is received from the BCM requesting the engine be turned OFF.
Diagnostic Aids
The RVS system will not operate if any of the following conditions are present:
• | More than 2 remote starts have been attempted. |
• | The hazard switch is in the ON position. |
• | A current hazard switch DTC is set. |
• | The vehicle hood is ajar. |
• | A current hood ajar DTC is set. |
• | The CTD system detects an alarm trigger. |
• | Excessive coolant temperature |
• | Accelerator pedal position greater than 0 percent |
• | Vehicle theft deterrent malfunction |
• | A current automatic transmission shift lock control system DRC is set. |
• | A vehicle speed sensor signal is detected by the ECM/PCM. |
• | A current vehicle DTC that illuminates the malfunction indicator lamp (MIL) |
The RVS disable history may be available in the BCM Output Controls Special Functions. Reviewing the scan tool RVS disable history (if equipped) before proceeding with this diagnostics.
Reference Information
Schematic Reference
Remote Function Schematics
Connector End View Reference
Remote Function Connector End Views
Description and Operation
Keyless Entry System Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
- 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. |
- Verify that the keyless entry functions operate with all available keyless entry transmitters.
- With a scan tool, verify that no RVS Disable History is present.
⇒ | If RVS disable history is present, refer to the applicable subsection in which the failure occurred. |
- With a scan tool, verify that there are no Current CTD Triggers present.