Question about 1990 Chevrolet C1500

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Starter relay switch

Where and how would i replace the relay switch?

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Look under the Hood and Locate the Fuse Relay Box. It should be on the Drivers Side Torwards the Firewall. The Starter Relay is Inside this Box, The Diagram for the Maxi-Fuses and Relays is on the Inside of the Box Lid or Inside the Owners Manual. Please Rate My Response! Thanks!

Posted on Feb 05, 2009

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My trunk will not open. When I take off battery cable and replace, it opens once. Is there an easy fix? relay etc?


When the rear compartment lid release switch is pushed, the rear compartment lid release signal circuit to the body control module (BCM) is grounded. BCM then grounds the coil side of the trunk release relay through the trunk release relay control circuit. With this voltage is applied to the rear compartment lid release actuator, opening the rear compartment.
Rear Compartment Lid Release Relay
  1. Ignition OFF, disconnect the trunk relay.
  2. Test for 65-90 ohms of resistance between terminals 85 and 86.
  3. ?‡'
    If the resistance is not within the specified range, replace the trunk relay.

  4. Test for infinite resistance between the following terminals:
  5. ?€¢
    30 and 86


    ?€¢
    30 and 87


    ?€¢
    30 and 85


    ?€¢
    85 and 87


    ?‡'
    If less than infinite resistance, replace the relay.

  6. Install a 10-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Measure for less than 2 ohms of resistance between terminals 30 and 87.
?‡'
If greater than 2 ohms, replace the relay.


Rear Compartment Lid Release Relay Malfunction

  1. Ignition OFF, disconnect the trunk relay.
  2. Verify that a test lamp illuminates between the coil side B+ circuit of the trunk relay and ground.
  3. ?‡'
    If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the voltage control circuit for a short to ground. If the circuit tests normal, test or replace the trunk relay.

  4. Verify that a test lamp illuminates between the switch side B+ circuit of the trunk relay and ground.
  5. ?‡'
    If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

  6. Disconnect the harness connector at the rear compartment lid latch.
  7. Ignition OFF, test for less than 5 ohm of resistance between the rear compartment lid latch ground circuit and ground.
  8. ?‡'
    If greater than the specifed range, test the ground circuit for an open/high resistance.

  9. Connect a test lamp between the trunk release relay control circuit and the coil side B+ circuit of the trunk relay.
  10. Command the trunk release solenoid ON and OFF with a scan tool.
  11. ?‡'
    If the test lamp remains ON all the time, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.


    ?‡'
    If the test lamp remains OFF all the time, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

  12. Connect the harness connector at the rear compartment lid latch.
  13. Connect a 3-amp fused jumper wire between the switch side B+ circuit of the trunk relay and the voltage control circuit of the lid latch. Verify that the lid latch activates.
  14. ?‡'
    If the lid latch does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the rear compartment lid latch.

  15. If all circuits test normal, test or replace the trunk relay.
Component Testing
Rear Compartment Lid Release Switch
  1. Ignition OFF, disconnect the harness connector at the rear compartment lid release switch.
  2. Test for infinite resistance between the trunk release switch supply voltage and ground terminals with the switch in the open position.
  3. ?‡'
    If less than infinite resistance, replace the rear compartment lid release switch.

  4. Test for less than 2 ohms of resistance between the trunk release switch supply voltage and ground terminals with the switch in the closed position.
  5. ?‡'
    If greater than 2 ohms, replace the rear compartment lid release switch.

  6. Test for infinite resistance between each terminal and the lid release switch housing/case.
?‡'
If less than infinite resistance, replace the rear compartment lid release switch.


Could be the relay , could be the switch , could be a problem with the BCM !

Apr 17, 2016 | 2007 Pontiac G6 GT Convertible

1 Answer

Relay switch how to replace,


What does the relay switch you want to replace do? Most vehicles have two fuse boxes.......one located under the dash somewhere, and one in the engine compartment. There are relays located on the firewall. Just need to know which relay you are talking about.

Jan 12, 2015 | Dodge Cars & Trucks

2 Answers

Hi, i have a 1997 jeep grand cherokee, and the brake lights will not go off. i have never seen this before, any suggestions?


Brake light switch is staying in the on position. It's located under the brake pedal. It will have to be replaced and can easily be done at home.

Feb 19, 2011 | 1997 Jeep Grand Cherokee

1 Answer

Is a brake relay switch the same as the brake switch? My brake lights stay on when the pedal isn't pressed down


No, the switch is above the brake pedal and the relay is under the hood. The problem can be either one. First pull the connector off the brake switch--there may be more than one connector, but pull them all off. If the brakes lights go out, replace the switch. If they dont, replace the relay. I guarantee the lights will go out if you pull the relay out. If the relay clicks when you push it back in, it's because the brake switch is shorted on. If the relay doesn't click, the relay is shorted on.

Feb 17, 2011 | 2002 Subaru Impreza

2 Answers

Have a 2000 ford windstar, the parking lights stay on when car is off along with the light switch. What could be wrong?


park relay may be shorted. find relay in engine compartment relay box. Pull relay out--lights should go out. Put back in, does relay click? If no and lights come on again, replace relay.
If relay clicks, suspect your headlight switch is shorted. let me know if you have questions.

Oct 11, 2010 | 2006 Ford Explorer

1 Answer

Horn relay clicks but horn doesn't blow


Remove and replace the Horn Relay. There should be a Spare Relay of the same Type (Size and Shape). OR
Switch out the suspected Horn Relay with another Relay in the Fuse/Relay of the same Type (Size and Shape) that is known to currently work. After the switch check the operations of both the Horn and the function you switched out. If the Horn works and the other function doesn't work any longer: The Relay was bad and needs to be replaced.

Jan 17, 2010 | 2005 Ford Taurus

2 Answers

Replaced starter relay but truck still will not start. Will start if I jump the relay. What else could the problem be.


The starter relay is energized by the ignition switch, through either the neutral safety switch, or the clutch safety switch.

Jan 16, 2010 | 1992 Nissan Pickup

1 Answer

How do you replace a relay switch on a 1988 300 mercedes. it looks like there are two of them behind the battery and the fire wall


There are actually 3 behind the battery and the fire wall. 1- Fuel relay switch. 2- AC relay control switch. 3- OVP Over voltage protection relay switch. They all have labels. To replace, just pull them upward. To have an easy access, remove the ECM unit blocking access first, then put it back after you replace the relay switch.

Sep 13, 2009 | 1988 Mercedes-Benz 300

1 Answer

1991 FORD THUNDERBIRD


THIS IS NOT CAUSED BY ANY RELAY, (THERE IS NOT ANY RELAY) IT IS CAUSED BY A BURNT CONNECTOR AND BURNT HEADLIGHT SWITCH, (BOTH AVIL FROM FORD DEALER) REPLACE THE CONNECTOR AND REPLACE THE HEADLIGHT SWITCH, BEEN A FORD DEALER TECH FOR YEAS AND HAVE REPLACED DOZENS OF THESE FOR THIS VERY PROBLEM

Aug 25, 2009 | 1991 Ford Thunderbird

1 Answer

95 Grand am replaced fuel pump and relay switch and nothing


No relay switch at the gas tank. But you may want to replace the fuel filter if you have not done that yet. Good luck and what is the problem???

Jul 29, 2009 | 1995 Pontiac Grand Am

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