I don't believe the DIFF LOCK light is doing a bulb check. To further explain, the problem started about a week ago during a long trip. I had stopped to pay a toll and when I took off again the DIFF LOCK light started to flicker intermittently and would turn completely off and back on again later as I drove. After that, I stopped a short time later and when I started up the truck again, the DIFF LOCK would flicker speradically and then shut off as soon as the ABS and SLIP lights turn on, and stay on. This would happen for the next few days. Now the DIFF LOCK light stays on for about 1 minute after I start the truck and would turn off exactly when the ABS and SLIP lights turn on, and stay on.
I googled the problem and seen quite a few other Frontier owners posting this exact problem, but no real solution to the problem has been posted. Have you seen postings on this issue or even heard of this combination of issues?
To be honest, I don't have a lot of faith in the local dealer. I have had some wrong diagnostics before and I don't want to start just throwing money at the problem. I want to be armed with some real good knowledge of what the problem likely is before I hear the dealer's recommendation to replace the entire drivetrain.
OK. I just got those codes checked.
C1187 - DIFF LOCK CONTROLLER
P1839 - POSI SWITCH ON
Here's a written summary of what was done:
"Tech checked for TSB's, but none were found.
While performing test on Differential Lock Switch is intermittently out of specification.
Reference values for Differential Lock Control Unit are as well out of specifications.
More diaganosis time is needed to find fault.
At this time, we are unsure as to what is causing concern. Technician will attempt to call tech-line for possible solutions but more diagnosis time is necessary to verify fault."
When I left the dealership, all the lights had stayed off for my 30+ mile drive to work and they are currently still off. However, I am not confident that they will not come back on.
When I brought my truck to the dealer this morning, they told me it would cost be $85 for diagnostics. After an hour looking at it, I was informed that it would be an additional $85/hour for them to continue to look at it. However at this time, they have no idea what it could be.
Before I throw any more money at them, I would like to see if you may have heard of this problem so that they could shortcut their diagnostics time. I don't want to pay them to conduct a research project for someting that may have already been thoroughly researched by someone else.
I hope you can help! Thanks!
Well, I drove about another 12 miles back home and the lights are still off. I even slipped while braking in the driveway and my ABS was working again.
I do not go off-roading, but I could imagine that it may have been possible that some road debris could have knocked something loose sometime or another.
Where exactly are these connectors and harnesses located on the vehicle? Are they all located on the rearend? What exactly are they connected to? (Maybe I can find these items on a diagram somewhere.)
Now I did notice the Tech had some lengths of wires hanging from the rearend. Could it have been possible that he had disconnected a loose connection while testing something and then fully reconnected it without realizing it? (I'm probably not so lucky!) Afterward, when I got back in the vehicle, the DIFF LOCK light was flashing. I saw the switch was on so I switched it off and that's when the DIFF LOCK light turned off and has stayed off (for now).
BTW, will this website let me pay you now and then pay you again if I keep this thread going? I definitely think you deserve to get something now for your help!