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Home >> Cadillac >> 2008 >> STS AWD V6-3.6L >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> B Code Charts >> B2730

B2730



DTC B2730

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.



DTC Descriptor
DTC B2730 02
- Trunk Release Switch Circuit Short to Ground




Diagnostic Fault Information






Circuit/System Description

The interior rear compartment lid release switch receives a signal from the driver door switch assembly (DDSA). When the interior rear compartment lid release switch is activated the signal circuit is pulled to ground. The DDSA interprets this and sends a GMLAN serial data message to the RIM requesting the rear compartment lid be released. The rear integration module (RIM) grounds the trunk release relay control circuit which energizes the TRK DR REL relay. The trunk release relay is supplied with battery voltage at all times. With the relay coil energized, the relay switch contacts close allowing battery voltage to flow to the rear compartment lid release actuator causing the rear compartment lid to release. The rear compartment lid release actuator is permanently grounded at G402. When the rear compartment lid release actuator releases the rear compartment lid, the rear compartment lid ajar switch, which is internal the rear compartment lid release actuator, is supplied with ground which causes the trunk ajar switch signal circuit to be pulled low. The trunk ajar switch signal circuit is an input to the RIM. When the RIM receives a trunk ajar signal, a GMLAN serial data message is sent to the instrument panel cluster (IPC) requesting the TRUNK OPEN message be displayed on the message center.


The exterior rear compartment lid release switch receives a signal from the remote control door lock receiver (RCDLR). When the exterior rear compartment lid release switch is activated the signal circuit is pulled to ground. The RCDLR interprets this and sends a GMLAN serial data message to the RIM requesting the rear compartment lid be released. The rear integration module (RIM) grounds the trunk release relay control circuit which energizes the TRK DR REL relay. The trunk release relay is supplied with battery voltage at all times. With the relay coil energized, the relay switch contacts close allowing battery voltage to flow to the rear compartment lid release actuator causing the rear compartment lid to release. The rear compartment lid release actuator is permanently grounded at G402.


Conditions for Running the DTC

* The DDSA must be powered.
* DTC B1325 Battery Voltage Out of Range, must not be current.



Conditions for Setting the DTC

The DDSA detects a short to ground in the interior rear compartment lid release switch signal circuit for more than 60 seconds.


Action Taken When the DTC Sets

The RIM stores DTC B2730 to memory.


Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.



Reference Information
Schematic Reference

* Remote Function Schematics ([1][2]Electrical Diagrams)
* Release Systems Schematics (Release Systems Schematics)

Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

* Keyless Entry System Description and Operation (Description and Operation)
* Luggage Compartment Description and Operation (Description and Operation)

Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information


Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the interior rear compartment lid release switch.
2. Ignition OFF, scan tool OFF, test for less than 10.0 ohms between the ground circuit terminal 1 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify the scan tool trunk release switch parameter located in the driver door switch menu is INACTIVE.

• If not the specified value, test the signal circuit terminal 3 for a short to ground. If the circuit tests normal, replace the DDSA.

4. Install a 3A fused jumper wire between the signal circuit terminal 3 and the ground circuit terminal 1. Verify the scan tool trunk release switch parameter is ACTIVE.

• 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 DDSA.

5. If the circuits test normal, test or replace the interior rear compartment lid release switch.



Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Front Side Door Window Switch Replacement (Front Side Door Window Switch Replacement)
* Control Module References (Programming and Relearning) for DDSA replacement, setup, and programming




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