Chevrolet Trax: Remote vehicle start malfunction

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of each diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Description

Remote vehicle start begins as a 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 vehicle start event will occur. If conditions are determined to be acceptable, the remote vehicle start message is sent to the engine control module (ECM). The ECM monitors system conditions such as engine control parameters and vehicle theft deterrent 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 remote vehicle start 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

• Unwanted or inadvertent door lock/unlock activation may be requested by the OnStar Remote Link application. It is possible that a customer may be unaware of account usage, resulting in an unwanted or phantom door lock/unlock. If normal system diagnosis results in an inability to verify the customer's concern, contact Technical Assistance Center (TAC).
• If the vehicle has a current 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.
• Only the first and second vehicle transmitters are able to control the remote vehicle start function.
• The remote vehicle start 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
• Incorrect BCM software is installed and vehicle start is not enabled
• 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

Reference Information

Schematic Reference

Remote Function Schematics (Encore), Remote Function Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Keyless Entry System Description and Operation

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

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

If any keyless entry functions do not operate properly

Refer to Keyless Entry System Malfunction.

If all keyless entry functions operate properly

2. Verify that no Diagnostic Status History or Start Disable items are present in the scan tool BCM Remote Start Diagnostic Status History and the ECM Remote Vehicle Start Disable History parameters

If remote vehicle start disable history items are present

Refer to the appropriate subsection in which the malfunction occurred.

If remote vehicle start disable history items are not present

3. Verify all scan tool BCM Content Theft Trigger History parameters display None.

If any BCM Content Theft Trigger History parameter does not display None

Refer to Content Theft Deterrent Malfunction .

If all BCM Content Theft Trigger History parameters display None

4. All OK.

Remote functions - Repair instructions

REMOTE CONTROL DOOR LOCK RECEIVER REPLACEMENT (WITHOUT UFL AND LDW)

Fig. 3: Remote Control Door Lock Receiver

Remote Control Door Lock Receiver Replacement (Without UFL and LDW)

REMOTE CONTROL DOOR LOCK RECEIVER REPLACEMENT (WITH UFL AND LDW)

Fig. 4: Remote Control Door Lock Receiver (With UFL and LDW)

Remote Control Door Lock Receiver Replacement (With UFL and LDW)

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