C1540

Read the instructions below then start the fault diagnostic procedure.

Symptom: Warning lamps for ABS and brakes are on as also is the central warning lamp. TCS OFF warning lamp is on. No ABS or TCS function.

C1540

Fault symptoms

Warning lamps for ABS and brakes are on as also is the central warning lamp.

TCS OFF warning lamp is on.

No ABS or TCS 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.

•	No power supply (+30 circuit) to the control module (pins 17 and 18).

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.