Precautions Before Working on the ACC System

Precautions to be taken before starting work on the ACC system

To avoid damaging the electronic components in the climate control unit, the following precautions must always be taken:

^ Before starting any work on the ACC system, disconnect the negative (-) battery lead.

^ Before starting any electric welding work, disconnect the negative (-) battery lead, the connector on the alternator voltage regulator and the 25-pin connector to the climate control unit.

^ Before connecting any test instruments or starting any fault-diagnosis work disconnect the 25-pin connector for the climate control unit.


^ M88 onwards:
When the ignition is on, the cooling fin on the governor for the cabin fan is live (12V). If the fin should be earthed, the governor will be irreversibly damaged.