First off, thanks 3050rpm for the suggested link. The only problem is that the CCU in the article is the digital version - I’ve got the older analog.
As of now, the climate control unit is no longer operating at all unless the battery is disconnected and then reconnected. This suggests that the issue is an electrical complication caused by bad ground wiring. Is this a reasonable assumption?
Being a layman, I’m not altogether familiar with the ground wiring of an automobile. According to the Bentley service manual (p. 100-13), there are 3 main ground points. The first is the main ground for the engine management system (positioned somewhere in the right rear of the engine compartment), the second is the main ground for the ignition coils (underneath the diagnostic connector), and the third is the main chassis ground (in the left front of engine compartment, behind left set of headlights).
My questions are as follows:
1. I believe there are other ground wires for other systems but where are their locations exactly?
2. The manual suggests wires “sometimes break internally or in areas not easily visible.” How does one replace such wires?
3. I’ve been unable to locate reference numbers for replacement wires. How does one purchase replacement ground wiring?