Thread: Power comes & goes to trip computer/HVAC

I'm not sure yet taman86, didn't do anything with it today as it was raining all day. But I did get some work done on the kitchen.

I'm hoping someone who has had this problem and found a solid fix chimes in before I buy any parts.

I recently fixed these same issues on my '02 GTP.
My HVAC controls, DRL, DIC, HUD all were acting flaky.

The ignition switch had to be replaced.

I tried the bypass first, hoping to save the cost and effort of replacing the switch assembly, but the bypass only worked for a few start cycles. The ignition switch contacts were badly scorched/burned.

Use this diagnostic process to verify that it is the switch: Sparky's Answers: 2002 Pontiac Grand Prix Blower Inoperative, Erratic When I checked mine, I found 0 volts at the HVAC/DIC fuse.

Excellent write-up on switch replacement procedure here:Sparky's Answers: 2002 Pontiac Grand Prix, Changing The Ignition Switch

The best, bullet-proof solution would be to replace the switch AND install the bypass with the new switch. If you do this, the new switch will never see the high current loads and it should last indefinitely.

Switches are available from any auto supply. I actually got the best price on a Delco unit. Good luck!
Joe

Originally Posted by jmt455

I recently fixed these same issues on my '02 GTP.
My HVAC controls, DRL, DIC, HUD all were acting flaky.

The ignition switch had to be replaced.

I tried the bypass first, hoping to save the cost and effort of replacing the switch assembly, but the bypass only worked for a few start cycles. The ignition switch contacts were badly scorched/burned.

Use this diagnostic process to verify that it is the switch: Sparky's Answers: 2002 Pontiac Grand Prix Blower Inoperative, Erratic When I checked mine, I found 0 volts at the HVAC/DIC fuse.

Excellent write-up on switch replacement procedure here:Sparky's Answers: 2002 Pontiac Grand Prix, Changing The Ignition Switch

The best, bullet-proof solution would be to replace the switch AND install the bypass with the new switch. If you do this, the new switch will never see the high current loads and it should last indefinitely.

Switches are available from any auto supply. I actually got the best price on a Delco unit. Good luck!
Joe

Joe, your information is greatly appreciated sir. Awesome link to Sparky's as well, thank you. I wish I could buy you a beer.

Do you think over the years this switch assembly has been upgraded? I guess I'm hoping after 11 years they fixed it. That bypass mod looks complicated.

This car was my Mothers before she passed on. To my knowledge, this has never happened to her for the whole time she owned the car. (about 7 years)

Chuck