Diagnostic Fault Information
Perform the
Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
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 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.
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 |
• | 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 DTC is set. |
• | A vehicle speed sensor signal is detected by the ECM. |
• | A current vehicle DTC that illuminates the malfunction indicator lamp (MIL) |
Reference Information
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
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 the hood closed, verify the scan tool Hood Ajar Switch parameter is Closed.
⇒ | If not the specified value, refer to Hood Ajar Switch Malfunction. |
- Verify no RVS disabling parameters are current as outlined in Diagnostic Aids.
⇒ | If any RVS disablers are current, refer to the appropriate subsection diagnostics. |
Circuit/System Testing
Hood Ajar Switch Malfunction
- Ignition OFF, disconnect the harness connector at the hood ajar switch.
- 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. |
- 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. |
- 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. |
- If all circuits test normal, replace the hood ajar switch.
Component Testing
Hood Ajar Switch
- Ignition OFF, disconnect the harness connector at the hood ajar switch.
- 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. |
- 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. |
- Test for infinite resistance between each terminal and the hood ajar switch housing.
⇒ | If not the specified value, replace the hood ajar switch. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM replacement, setup, and programming