Remote Vehicle Start Malfunction
Remote Vehicle Start Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of each diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
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). 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.
Diagnostic Aids
Important: If the vehicle has a current vehicle DTC that illuminates the malfunction indicator lamp (MIL), the cause of the DTC must be diagnosed before proceeding with the Remote Vehicle Start Inoperative diagnostic.
The RVS system will not operate if any of the following conditions are present:
* A current vehicle DTC that illuminates the malfunction indicator lamp (MIL)
* The vehicle is in valet mode.
* 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 engine RPM
* Excessive coolant temperature
* Accelerator pedal position greater than 0 percent
* Vehicle not in park
* 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.
Reference Information
Schematic Reference
Remote Function Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Connector Views
Description and Operation
Keyless Entry System Description and Operation (with ATH) Keyless Entry System (with ATH)Keyless Entry System Description and Operation (without ATH) Keyless Entry System (without ATH)
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module Referencesfor scan tool information
Circuit/System Verification
1. Verify that RVS is enabled through vehicle personalization.
• If RVS is not enabled, use vehicle personalization to turn on RVS functionality. Refer to the vehicle owners manual.
2. Verify that the keyless entry functions operate with all available keyless entry transmitters.
• If the keyless entry system does not function properly, refer to Remote Control Door Lock Transmitter Learn (without ATH) Remote Control Door Lock Transmitter Learn (without ATH).
3. Observe the scan tool ECM and BCM RVS Disable History parameters, Verify that no RVS Disable History items are present.
• If RVS Disable History items are present, refer to the appropriate subsection in which the failure occurred.
4. Verify the scan tool BCM Current CTD Trigger parameter displays None.
• If not specified value, refer to Content Theft Deterrent Malfunction Content Theft Deterrent Malfunction.