91 ZR-1 Electrical issues - ZR-1 Net Registry Forums

91vettezr1 · 05-16-2020

Hi
I hope everyone is well. I took my ZR-1 out today 1st time since Nov. Last time I drove it everything was fine. I noticed I left my glove box was open and I was expecting a dead battery.Car started right up but I noticed other things not working.
1. No courtesy lights, dome ,pillar etc. Light on rear view mirror does work. Turned dimmer switch but that didn't help.
2. Radio turns on looks normal, CD, radio all look normal but no sound, antenna won't go up.
3. Heat/AC controls nothing lit up. DEAD.
Everything else checked out on the car switch wise ,car ran great.
I checked all the fuses on passenger side fuse box, all ok, FUSE (1) 15 amp seems to control most of these items. I replaced even though it was fine. No luck. Checked AUX fuses on passenger side under hush panel , all fine.
I checked that door light switches were working, they read door ajar so I think that is not the issue. I did leave that glove box open for several weeks with trickle charger on.I read somewhere I could have burned out a relay some where. Any help would be appreciated
Thanks
Todd Cerami

91vettezr1 · 05-17-2020

battery at 12.8, checked for codes and it came up with H25 "courtesy lamp relay circuit open or shorted to ground" gonna have to do some searching on this now, swapped courtesy lamp relay with the same type of relay from road lamps relay, no change.so that eliminates that.
what is best way to check them, run multimeter to one end and stick a pin in the wire going to rest of car and check for continuity? i don't want to tear into all of them there is about 6 or 7 .haven't got in there yet.
I checked the Courtesy fuse one more time ,even though I replaced it. I couldn't believe it but it was blown. I replaced it and everything works. Maybe me swapping relays did something? The relay that I swapped is working fine on the driver lights. Who knows just happy it's fixed.

Corvette95 · 05-17-2020

Glad you fixed it, I posted on your thread over in the Forum. The H25 is likely a history code from when the glove box lamp shorted. Clear it, and then see if it comes back...probably won't.

05-16-2020	#1
91vettezr1 Join Date: May 2004 Posts: 451	91 ZR-1 Electrical issues Hi I hope everyone is well. I took my ZR-1 out today 1st time since Nov. Last time I drove it everything was fine. I noticed I left my glove box was open and I was expecting a dead battery.Car started right up but I noticed other things not working. 1. No courtesy lights, dome ,pillar etc. Light on rear view mirror does work. Turned dimmer switch but that didn't help. 2. Radio turns on looks normal, CD, radio all look normal but no sound, antenna won't go up. 3. Heat/AC controls nothing lit up. DEAD. Everything else checked out on the car switch wise ,car ran great. I checked all the fuses on passenger side fuse box, all ok, FUSE (1) 15 amp seems to control most of these items. I replaced even though it was fine. No luck. Checked AUX fuses on passenger side under hush panel , all fine. I checked that door light switches were working, they read door ajar so I think that is not the issue. I did leave that glove box open for several weeks with trickle charger on.I read somewhere I could have burned out a relay some where. Any help would be appreciated Thanks Todd Cerami Last edited by 91vettezr1; 05-16-2020 at 07:43 PM.

05-17-2020	#2
91vettezr1 Join Date: May 2004 Posts: 451	Re: 91 ZR-1 Electrical issues battery at 12.8, checked for codes and it came up with H25 "courtesy lamp relay circuit open or shorted to ground" gonna have to do some searching on this now, swapped courtesy lamp relay with the same type of relay from road lamps relay, no change.so that eliminates that. what is best way to check them, run multimeter to one end and stick a pin in the wire going to rest of car and check for continuity? i don't want to tear into all of them there is about 6 or 7 .haven't got in there yet. I checked the Courtesy fuse one more time ,even though I replaced it. I couldn't believe it but it was blown. I replaced it and everything works. Maybe me swapping relays did something? The relay that I swapped is working fine on the driver lights. Who knows just happy it's fixed.

05-17-2020	#3
Corvette95 Join Date: Jan 2006 Location: Decatur, AL Posts: 1,119	Re: 91 ZR-1 Electrical issues Glad you fixed it, I posted on your thread over in the Forum. The H25 is likely a history code from when the glove box lamp shorted. Clear it, and then see if it comes back...probably won't. __________________ Corvette95 Registry and Forum (*************) 1989 C4 Conv Wht/Gry Auto Hardtop Top Flight SOLD 1995 C4 Coupe Purple/Blk 6 Speed 1989 C4 Conv Wht/Red Auto SOLD 1996 C4 Conv Black/Tan Auto SOLD 1994 C4 Coupe Wht/Blk SOLD 1995 C4 ZR-1 White/Gry #278 Dual Dunn Head SOLD 1986 C4 Coupe Black/Red 4+3 SOLD 1990 C4 ZR-1 Red/Red #0454