Mercedes C-Class - ESP/ABS pilot lamp lights up | HELLA
Mercedes
C-Class (W 203)
All vehicles above model year 02/03
ESP/ABS pilot lamp lights up
If a customer complains about the above error, this could be caused by a corroded plug connection. Error codes C1140 (steering wheel angle sensor, incorrect signal) and C1145 (ABS wheel speed sensor VR, interruption) may occur.
In this case, proceed as follows:
1. 
Check connector pins 18, 19 and 20 (all three on the brake pressure sensor) of the plug connection on the ABS/ESP control unit (see Fig.); clean and dry if necessary. The control unit is located in the left side of the engine compartment in the control unit box behind the spring dome.
2. If damage is already severe, use the repair kit to replace the pins.
3. Treat the plug connection with electronic spray or grease before contacting.
4. Check the wiring harness of the brake pressure sensor for continuity. Max. resistance is 0.5 Ohm.
Important safety note
Technical information and practical tips have been compiled by HELLA in order to provide professional support to vehicle workshops in their day-to-day work. The information provided on this website is intended for use by suitably qualified personnel only.
Reprinting, distribution, reproduction, exploitation in any form or disclosure of the contents of this document, even in part, is prohibited without our express, written approval and indication of the source. The schematic illustrations, pictures and descriptions serve only for the purposes of explanation and representation of the instructions and cannot be used as a basis for installation or assembly work. All rights reserved.
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