Steering Heated Steering Wheel Malfunction

SI B32 01 09
Steering and Wheel Alignment

October 2010
Technical Service

This Service Information bulletin supersedes SI B32 01 09 dated October 2009.

[NEW] designates changes to this revision

SUBJECT
Heated Steering Wheel Malfunction

MODEL
E90, E91, E92, E93 (3 Series) produced from 9/2008 and equipped with the Heated Steering Wheel (SA 248)

E82, E88 (1 Series) produced from 9/2008 and equipped with the Heated Steering Wheel (SA 248)

SITUATION

Immediately following a cold start, if the heated steering wheel is switched on in addition to other electrical consumers (i.e., heated seats, rear defroster, etc.), it may switch off after 5-10 seconds of operation. This is an intermittent situation. Cycling the key will typically restore function.

CAUSE

For the first few seconds after start-up, voltage levels may dip momentarily when electrical consumers are switched on. If the supply voltage dips below the threshold for the heated steering wheel, it will be switched off.

This situation may be present even if the battery is properly charged and no charging system problems are present.

CORRECTION

Refer to ISTA diagnosis for the required repair procedure.

[NEW] PROCEDURE

The problem has been integrated into ISTA diagnostics. Follow the diagnosis test plan, using the latest ISTA version.

In "Information Search", select the "Function Structure" tab. Select "Steering Wheel Heating", then press "Start Search".

Select test plan "W3233_WAS2 malfunction of steering wheel heater".

WARRANTY INFORMATION

Refer to the KSD2 to code the repair performed as prescribed by ISTA diagnosis results and the Warranty Policy and Procedures Manual for specific warranty coverage.