Disclaimer2010 Cadillac Truck Escalade RWD V8-6.2L Technical Service Bulletin # 09-08-50-017B Date: 100211

Electrical - No Crank/No Start/Discharged or Low Battery

TECHNICAL

Bulletin No.: 09-08-50-017B

Date: February 11, 2010

Subject: No Crank, No Start, Discharged or Low Battery (Reprogram Rear Heated Seat Module)

Models:

2006-2010 Cadillac DTS

Built Prior to February 2, 2010

2007-2010 Cadillac Escalade, Escalade ESV

2007-2010 Chevrolet Suburban, Tahoe

2007-2010 GMC Yukon, Yukon XL

Built Prior to November 30, 2009

All Equipped with Rear Heated Seat RPO KA6

Supercede:

This bulletin is being revised to add build breakpoint dates. Please discard Corporate Bulletin Number 09-08-50-017A (Section 08 - Body and

Accessories).

Condition

Some customers may comment about a no crank/no start condition or a discharged or low battery.

Note

This condition may be intermittent, therefore it is important to check if a revised calibration has been released on TIS2WEB for this concern, even

if the condition cannot be duplicated at the dealer.

Cause

This condition may be caused by the rear heated seat module (RHSM) discharging the battery by keeping the serial data bus active, which creates a

cumulative continuous draw of four amps on the battery after the vehicle is shut down, until the state of charge reaches three volts.

Correction

Important

DO NOT replace the RHSM or the battery for this concern.

Reprogram the RHSM with the latest software calibration.

Important

Select the correct calibration files for the appropriate vehicle configuration (body style) and RPO codes.

A revised calibration has been developed to address this condition. Technicians are to reprogram the RHSM using the Service Programming

System (SPS) with the latest software available on TIS2WEB. Refer to the Service Programming System (SPS) procedures in SI.

When using a Tech 2(R) or a Multiple Diagnostic Interface (MDI) for reprogramming, ensure that it is updated with the latest software version.

During programming, the battery voltage must be maintained within the proper range of 12-15 volts. Only use the approved Midtronics(R) PSC 550

Battery Maintainer (SPS Programming Support Tool EL-49642) or equivalent during programming.

2010 Cadillac Truck Escalade RWD V8-6.2L Page 280

Warranty Information

For vehicles repaired under warranty, use:

Mercedes Benz