Blower Motor Will Not Run In Any Mode
WARNING: This page is about a different car, the 1996 Buick Roadmaster. However, it is still accessible from the selected car via links, so may be relevant.
- Turn ignition to RUN position and A/C-heater control panel to AUTO. Using voltmeter, backprobe blower motor control module C1 connector terminal "B" (Gray/Black wire). Set blower speed to lowest speed setting. Slowly increase blower speed while observing voltmeter. If voltage varies with blower speed setting, go to next step. If voltage does not vary with blower speed setting, check for open or short to ground in Gray/Black wire between blower motor control module and A/C-heater control panel. If Gray/Black wire is okay, replace A/C-heater control panel.
- Disconnect blower motor control module C2 connector. Using voltmeter, measure voltage between ground and blower motor control module C2 connector terminal "B" (Orange wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short to ground Orange wire between blower motor control module C2 connector and HVAC MOD FUSE fuse.
- Using voltmeter, measure voltage between blower motor control module C2 connector terminal "B" (Orange wire) and C1 connector terminal "C" (Black wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Black wire.
- Turn ignition off. Reconnect blower motor control module connectors. Disconnect blower motor connector. Using voltmeter, measure voltage between ground and blower motor connector terminal "B" (Purple wire). Turn ignition to RUN position. Set blower motor speed to lowest setting. Slowly increase blower motor speed setting. If voltage varies with blower motor speed setting, go to next step. If voltage does not vary with blower motor speed setting, check for open or short to ground in Purple wire between A/C-heater control panel, blower motor, and blower motor module. If Purple wire is okay, replace blower motor control module.
- Using voltmeter, measure voltage between blower motor control module C2 connector terminal "B" (Orange wire) and blower motor connector terminal "A" (Black wire). If battery voltage exists, check for corrosion on blower motor terminals. If terminals are okay, replace blower motor. If battery voltage does not exist, repair open in Black wire.