The U30 12V supply to the climate control system (E138) is above 16V.
1. Check if any other control system has a DTC for high voltage. If other control systems also has this DTC, check the voltage delivered by the 12V battery supply. 2. Check the battery supply cable harness to the climate control system.
What you'll see
All actuators connected to the climate control system will shut off. LED indicators will be deactivated. When the fault has disappeared, it can take up to 60 s until LIN nodes are functioning again.
System reaction
All actuators connected to the climate control system will shut off. LED indicators will be deactivated. When the fault has disappeared, it can take up to 60 s until LIN nodes are functioning again.
Diagnostic depth
The supply voltage is measured by the climate control system. The test is performed continuously.
1. Failures in the components or the cable harness that deliver the battery supply voltage to the climate control system. 2. 12V supply to LIN nodes is short circuit to the 24V battery supply.