2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 612

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 612

DTC Descriptors

DTC B2508 01

- Seat Heater Relay Circuit Short to Battery

DTC B2508 02

- Seat Heater Relay Circuit Short to Ground

Diagnostic Fault Information

Circuit/System Description

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

individual element control circuits. The HSM 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 HSM 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 HSM 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 HSM must be powered.

Conditions for Setting the DTC

B2508 02

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