2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 655

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 655

Circuit/System Description

The rear seat heating elements are controlled by a common high current relay internal to the rear heated seat module (RHSM) and on the low side

by individual element control circuits. The RHSM connects the seat heater element supply voltage circuits to a common reference point. This

reference point is biased to approximately 2.5 V. Before the RHSM will allow heated seat operation, it checks to see if the heating element supply

voltage circuits and control circuits are shorted to ground or battery voltage. Once the RHSM verifies that it is not closing to a shorted heating

element, it allows heated seat operation. After which it continues to monitor for a shorted circuit.

Conditions for Running the DTC

The RHSM must be powered.

Conditions for Setting the DTC

B2508 02

Before the heated seats are activated, the RHSM detects a short to ground on the seat heating element supply voltage circuit or control circuit.

B2508 01

Before the heated seats are activated, the RHSM detects a short to battery voltage on the seat heating element supply voltage circuit or control

circuit.

Action Taken When the DTC Sets

The heated seat function for both seats will be disabled.

Conditions for Clearing the DTC

* The current DTC clears when the malfunction is no longer present and the power mode changes to OFF then back to ACC or RUN.

* The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.

Reference Information

Schematic Reference

Heated/Cooled Seat Schematics ()

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Heated Seats Description and Operation (KA1) ()Heated Seats Description and Operation (KA6) ()

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)