DIC Bulb Location - Page 2 - ZR-1 Net Registry Forums

GOLDCYLON · 08-07-2021

Quote:

Originally Posted by TX '90 ZR1

Richard,
Was at the car today, so verified the "Service ABS" light operation on it.
The "Service ABS" light illuminates for a short period upon turning the ignition on. Does not stay on very long at all. Maybe 2 seconds then goes out.
Location of the light is immediately to the right of the "Service Engine" light which stays on until car is started.
For reference, my car is a '90 # 0442. I would assume all 90's would function the same, but you know what assuming gets you!!

The ABS is normal as it goes through a start up check upon starting you can even hear the pump behind you momentarily whirring behind the drivers seat

richarde · 08-07-2021

Thanks for the replies. No 'Service ABS' light appears in the DIC on initial ignition switch on. The ABS unit behind the driver's seat does whir for a short while on ignition turn on. I know that there is a bulb in the 'Service ABS' location within the DIC as I took a picture of it some while ago when I had the DIC removed. What I do not know is whether that bulb works or has blown! I will check this out. Thanks again.

Marc Haibeck · 08-09-2021

The 'ABS Active' indication was first implemented in '91. It will turn on for a second during the pump self test when the car goes to about 8 mph following key on. In '91 a relay was added to drive the light. The light can be activated on a '90 if you copy the wiring and add the relay as shown in the '91 service manual. I did it once to diagnose a '90 car with big brakes and was locking the wheels too much. The solution to the problem was to change to a brake pad with less friction.

richarde · 08-09-2021

Thanks Marc - Really interesting and informative information, especially to those of us with 1990 ZR-1's.

08-07-2021	#12
richarde Join Date: Sep 2012 Location: United Kingdom Posts: 68	Re: DIC Bulb Location Thanks for the replies. No 'Service ABS' light appears in the DIC on initial ignition switch on. The ABS unit behind the driver's seat does whir for a short while on ignition turn on. I know that there is a bulb in the 'Service ABS' location within the DIC as I took a picture of it some while ago when I had the DIC removed. What I do not know is whether that bulb works or has blown! I will check this out. Thanks again. __________________ Richard 1990, numbers 1821 and 2391 1821 - owned since Nov 2002, charcoal / Gray, Stainless headers, B&B system, 4.10's 2391 - owned since Jan 2019, Black / Black, have completed restoration. Jeal headers, Corsa system, 4.10's, Aluminum flywheel with Carolina clutch.

08-09-2021	#13
Marc Haibeck Join Date: May 2007 Location: Addison IL Posts: 250	Re: DIC Bulb Location The 'ABS Active' indication was first implemented in '91. It will turn on for a second during the pump self test when the car goes to about 8 mph following key on. In '91 a relay was added to drive the light. The light can be activated on a '90 if you copy the wiring and add the relay as shown in the '91 service manual. I did it once to diagnose a '90 car with big brakes and was locking the wheels too much. The solution to the problem was to change to a brake pad with less friction.

08-09-2021	#14
richarde Join Date: Sep 2012 Location: United Kingdom Posts: 68	Re: DIC Bulb Location Thanks Marc - Really interesting and informative information, especially to those of us with 1990 ZR-1's. __________________ Richard 1990, numbers 1821 and 2391 1821 - owned since Nov 2002, charcoal / Gray, Stainless headers, B&B system, 4.10's 2391 - owned since Jan 2019, Black / Black, have completed restoration. Jeal headers, Corsa system, 4.10's, Aluminum flywheel with Carolina clutch.