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 start begins as an radio frequency message received by the body control module (BCM) from a keyless entry transmitter. The BCM monitors system conditions such as content theft deterrent, hood ajar status, and body DTCs to determine if a remote start event will occur. If conditions are determined to be acceptable, the remote start message is sent to the engine control module (ECM). The ECM monitors system conditions such as engine control parameters and the immobilizer system to determine if engine starting will be allowed. If conditions are acceptable, the ECM will activate the appropriate vehicle systems.

Diagnostic Aids

* Unwanted or inadvertent remote start activation may actually be triggered by the OnStar(R) Remote Link Apps. Customer may be unaware of account usage, contact Technical Assistance Center (TAC) if root cause cannot be diagnosed to vehicle.

* A remote start event will not always start the vehicle engine. If the high voltage battery state of charge is sufficient to operate the vehicle systems or the vehicle is plugged in and the ambient air temperature is above -3.33°C (26°F), the engine will not start. This temperature threshold setting will be adjustable through vehicle personalization beginning mid model year 2012.

* If the vehicle has a current vehicle DTC that illuminates the malfunction indicator lamp, the cause of the DTC must be diagnosed before proceeding with the remote start malfunction diagnostic.

Reference Information

Schematic Reference

Remote Function Schematics [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1

Description and Operation

Keyless Entry System Description and Operation Description and Operation

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 Programming and Relearning for scan tool information

Circuit/System Verification

1. Verify that remote vehicle start is enabled through vehicle personalization.

• If remote vehicle start is not enabled through vehicle personalization
Use vehicle personalization to turn on remote vehicle start functionality. Refer to the vehicle owners manual.

• If remote vehicle start is enabled

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

• If the keyless entry functions do not operate properly
Refer to Keyless Entry System Malfunction (Active) Keyless Entry System Malfunction (Active)Keyless Entry System Malfunction (Passive) Keyless Entry System Malfunction (Passive).

• If the keyless entry functions operate properly

3. Verify none of the following conditions exist on the vehicle:

* 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 content theft deterrent 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 DTC is set.

* A vehicle speed sensor signal is detected by the ECM.

• If any of the conditions are present
Refer to the appropriate subsection in which the failure occurred.

• If none of the conditions are present

4. All OK.