Climate Control not working

1998 BMW 528

157,000 MILES • 6 CYL • 2WD • AUTOMATIC

LAWRENCE412

MEMBER
1 POST

i replaced the climate control unit in the dash, it was in peices when i bought the car. now it seems there is no power to it. i checked the fuses, and replaced them, they where missing. where where do i go from here

Jun 3, 2011 at 9:05 PM

BMRFIXIT

✓Experienced Mechanic
19,053 POSTS

Constant battery power supply (KL30) is necessary for IHKA operation as well as memory (early systems).
Switched ignition power (KL15) is required for IHKA operation when the ignition is in the "run" position. This allows the system to operate after the vehicle has been started (or limited IHKA operation if the engine is not running).
Grounds KL 31
Ground paths are provided to the IHKA to complete the circuits of the inputs, processing, and output control functions

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Jun 4, 2011 at 5:25 AM