Starter Relay
 

Location of the 5 pronged starter relay switch on the 2007 H3?

Starter is starting to click without engaging occasionally, and continue engaging after the key is released - occasionally as well.

Planned to swap the relay switch first, then the starter if need be. I'll approach other issues if the problems still persist.

did you check the owners manual. I will be out there later to see if I can find it.

Nothing in the owner's manual mentioned. I'll try to download the service manual mentioned if the dealer won't cough up the location.

Thanks

Check inside fuse box there is some relays

wiring diagram shows #85 (30amp fuse)
77 (pcm) & 78 relay(run/crank)

(page 2 below)

http://achim1000.bplaced.net/hummerf...ELECTRICAL.pdf

swap the 78 with the 87, try for a few days, if all is normal, change the relay.

http://ww2.justanswer.com/uploads/Sp...aegwtgwtgw.gif

TSB 09-06-03-004

2005-09
All Vehicles - Diagnosing and repairing fretting corrosion
Do this--- Disconnect affected connector and apply lube
Dont do this--- Don't replace modules without duplicating condition
09-06-03-004




Fretting corrosion is a buildup of insulating oxidized debris (nonconductive material) caused by micro motion between two contact surfaces. (Fig 1)


It's commonly found on tin plated terminals, such as Micro pack 100 and Micro pack 64 connections.


Past Serviceability Issues

Replacement of sensors, modules and other components will result in only a temporary relief of a fretting issue. Actually, just the cycling of a connector will clear the fretting corrosion from the terminal, correcting the condition for a short time until fretting corrosion builds back up again.

Typical issues caused by fretting corrosion include:
- Intermittent electrical component operations
- DTCs being set, or No Trouble Found (NTF)
- Low current signal circuits -- fretting corrosion (high resistance) can cause intermittent connections
- High current power circuits -- permanent increases in the connection resistance can lead to overheating


Evidence of Fretting

Fretting usually appears as:
- small, dark smudges on electrical terminals
- smudges at the locations of electrical contact (Fig. 2)
http://www.sandyblogs.com/techlink/A...%20Fig%202.jpg

In less severe cases, it may require a magnifying glass to identify a fretting condition.


Causes of Fretting

Fretting is caused by the motion between the connector and the terminal, which can be due to:
- Vibration - micro motion between two contact surfaces causing build up of insulating oxidized debris (nonconductive material)
- Thermal cycling
- Packaging of the connector, wiring harness and/or device
- Poor connection/terminal retention


With continued microscopic fretting, enough insulating tin-oxide wear debris can build up high resistance creating intermittent connections. (Fig. 6)

http://www.sandyblogs.com/techlink/A...%20Fig%206.jpg

Service Solution

Disconnecting and reconnecting a connector will temporarily "fix" a fretting condition, but it will eventually come back if the conditions for fretting still exist. The best preventative measure is to perform the following:
1. Disconnect the appropriate module(s)/connector(s)
2. Lube both sides of the connector (module side and harness side) with NyoGel 760G lubricant, GM part number 12377900 (in Canada, P/N 10953529)
3. Reconnect the connector
4. Wipe away any excess lubricant
5. Duplicate the condition per the SI Diagnostic Procedure Instruction section
- Circuit/System Description
- Conditions for Running/Setting the DTC
- Circuit/System Verification

IMPORTANT: If the condition CANNOT be duplicated, the repair is complete. DO NOT replace the module/component/part.

while starting h2, turn key h2 fires then shuts down everything on cluster flashes clicking noise(relays ? ) whine noise through speakers have to turn off to try starting again

check,clean,tighten batt terminals. then, ?

2007 h3 blow fuse
 

I got a 2007 hummer h3 won't crank and no power to dash. I found the fuse number 84 blow. What would do the fuse to blow? Also key stuck in ignition.

Fuse 84 is for your trailer harness.
Check the trailer wire harness behind the rear bumper where they attach the harness to the frame.

Look between the rear bumper (near the license plate) and the rear door (when open). There is a wire harness there tat rubs against the frame. Find that section and remove all of the tape and coverings. Repair the frayed or broken wire! Do not reattach to the frame, let the harness hang after to shrink wrap and tape the harness.

This question is fine, but why dig up a 4.5 year OLD thread on a different topic to post it in??????

Do you have a trailer hitch with the trailer wiring plug? If so, open the cover of the trailer wiring plug and clean it out and then spray electrical contact cleaner in there.

The Key is stuck = GM's way of telling you your battery is dead.