BenzWorld Junior Member
Date registered: Nov 2004
Vehicle: SLK 320 Tip 2000m/y
Location: Stafford UK
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MB - R170 (2000m/y) Interior Light - Interior Lamp Operation - Faulty
The interior light has two switches. One selects DOORS/OFF whilst the other is a simple ON/OFF override.
If Override ON is operated the light illuminates but does not auto extinguish after X secs (battery conservation).
If DOORS is selected (with the doors shut) the light illuminates. Even worse it does not auto extinguish after X secs.
I can find nothing wrong electrically/mechanically. I believe that the problem lies somewhere in the electronics (inter module CAN communications). ﾃつ*
Switches + Soft fade work fine when harness disconnected from PSE (pneumatic/security control unit in boot), but of course this disables security system.
MB defined DTC's were B1021 (CAN fault N10-1 or A37), B1711 (Alarm activated via hood switch S62), B1132 (Alarm activated via S62/7 glovebox switch), B1725 Alarm activated via ATA towing sensor in PSE), B1709 (Component H3 alarm siren - not fitted or not coded). ﾃつ*
Several of these may have been as a result of my system investigations and it may be necessary to have a retest done without further tampering with the system. Do I really want to pay another ﾃつ｣35?
My Dyno-Scan isn?t intended to resolve problems other than with the engine module but I wonder whether the spurious U0900, U0D00, B3FF9, B10CF codes that are still displayed after a ?Cancel all DTC,s? is a continuing indicator of a CAN issue between ATA and PSE modules? Unfortunately Dyno-Scan cannot cross ref the hexadec codes for me. Wouldn?t that info be useful!
I wonder where the siren is supposed to be fitted? I could then ascertain whether it is missing or faulty. I wonder whether the siren was disconnected to prevent spurious ATA warnings and that the cause may be common with the Interior light problem.
MB advised that problems of this type could (would?) be very expensive in time and new module(s)!
Any help / information would be appreciated ﾃつ*