Power and Ground Distribution: Testing and Inspection

01 supply (terminal 30)

Possible cause(s) of fault:
Supply (terminal 30) in the wiring harness interrupted

Internal supply in the steering angle sensor interrupted

Storage condition(s):
After ignition on, there is a check as to whether terminal 30 is on, and if this is not the case the interruption counter is incremented upwards by one per ignition start. If the interruption counter reaches a value specified by the coding data (approx. 250), a fault entry is made.

With some software versions, a correct reset of the RAM memory is not always possible in the case of power supply interruptions, which means that the fault is entered incorrectly.

Troubleshooting procedure:
Switch the ignition on/off and observe the terminal 30 interruption counter

Interruption counter increases: the positive supply is interrupted either in the wiring harness or in the steering angle sensor:
Repair the wiring harness (cable, fuse, connector) or replace the steering angle sensor, as required

Interruption counter does not increase: the positive supply was either sporadically interrupted due to a loose contact or the fault was entered because of a power supply interruption:
Rectify the loose contact or ignore the fault

Note:
Wire tests and checks for loose contacts are possible via preset measurements.

After replacing the steering angle sensor, it must first be coded and then calibrated using the ABS/DSC diagnostic program.