ABS With ESP and TCS

C1540
Solenoid valves. Open Circuit

Diagram:

Fault Symptoms
Warning lamps for ESP and brakes are on as also is the central warning lamp.
ESP OFF warning lamp is on.
No ABS, TCS, ESP function.

Conditions
If there is no current supplied to three or more of the valves.
If the control module's internal voltage relay is defective.
The control module lacks +30 power supply.

Diagnostic Help
The solenoid valves can be activated using the diagnostic tool.
- Select "Activate".
- Select "Valves".

The respective valve can then be selected in the sub-menu. The selected valve is activated for about 30 seconds at a frequency of 1 Hz.