A/C-Heater Control To Programmer Data Loss
WARNING: This page is about a different car, the 1996 Buick Park Avenue and 1996 Buick LeSabre. However, it is still accessible from the selected car via links, so may be relevant.
- Perform NORMAL SYSTEM RESPONSE TEST. Turn ignition off. Disconnect A/C-heater control connector. Turn ignition switch to RUN position. Using Tech 1 scan tester, select HVAC DTC. Connect jumper wire between A/C-heater control connector terminals B1 (Light Blue wire) and B2 (Purple wire). If DTC 35 status does not change from current to history, go to next step. If DTC 35 status changes from current to history, replace A/C-heater control.
- Turn ignition off. Disconnect A/C-heater control connector. Turn ignition switch to RUN position. Using voltmeter, measure voltage between A/C-heater control connector terminals A8 (Black wire) and B1 (Light Blue wire). If approximately 8 volts is not present, go to next step. If approximately 8 volts is present, go to step 4).
- Using voltmeter, backprobe and measure voltage between programmer connector terminals E1 (Black/White wire) and F12 (Purple wire). If voltage is approximately 8 volts, repair open Purple wire. If voltage is not approximately 8 volts, inspect connector for proper terminal contact. If connections are okay, replace programmer.
- Reconnect A/C-heater control. Press A/C-heater control OFF button. Using voltmeter, backprobe between connector terminals B1 (Light Blue wire) and B2 (Purple wire). If voltage is approximately 3.5 volts, go to next step. If voltage is not approximately 3.5 volts, inspect for proper connector terminal contact. If terminals are okay, replace A/C-heater control.
- Using voltmeter, backprobe between programmer connector terminals E1 (Black/White wire) and E16 (Light Blue wire). If voltage is approximately 3.5 volts, inspect connector for proper terminal contact. If terminals are okay, replace programmer. If voltage is not approximately 3.5 volts, repair open Light Blue wire.