A0B2
HighA0B2 — Terminal 30E Power Supply Fault
Description
What the Code Means
Code A0B2 logs low or missing voltage at terminal 30E, the constant power line. The CAS (Car Access System) module monitors the voltage at this terminal and sets the fault when power drops or disappears.
Terminal 30E supplies the memory and wake-up functions of the CAS module. Under normal conditions voltage is present at this terminal at all times, regardless of ignition state. Typical causes are a blown fuse, a faulty relay, or damaged wiring.
Symptoms
Symptoms
- key fob doesn't work;
- central locking problems;
- battery drain;
- warning lights on the instrument cluster.
Causes and fixes
Diagnosis and Repair
- Check the fuse for the terminal 30E circuit — it's usually in the fuse box.
- Measure voltage at the CAS connector pin that handles terminal 30E.
- Inspect the wiring for corrosion or mechanical damage.
- Replace the blown fuse or repair the damaged section of wiring.
- Clear the fault codes and run a verification test.
Possible secondary damage
Secondary Issues
- with intermittent power, the CAS module can lose its memory settings and need reprogramming;
- running for a long time at low voltage can take the CAS module out of service.