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One day everything is fine then the next I get a “Service Engine Soon” and I do not have traction control or abs. In diagnostic mode it says TCS no comm. It also says no comm for Hvac. My reverse lights also do not work but they light up when I lock or unlock the car. Here are the codes that were current. 10-pcm p1571 h c
The P1689 is a EBCM issue and the B0432 is a RR Defogger one...as you can see in my 01 FSM wiring schematics the ORANGE wire from the ignition switch feeds the HVAC module and the RR DEFOGGER Relay...also the EBCM is fed off this Orange ignition feed wire too...just a hunch but maybe you have low voltage to those components...if you have a DVOM connect the positive lead of the DVOM to battery positive and connect the black lead of the DVOM to either test point on top of fuse 18 (HVAC) with the engine running...we are going a voltage drop check across the contacts of the ignition switch..what you should see on the DVOM is maybe .2 to .3 volts...if you see 4 volts for instance only 8 volts is getting to these components..,system voltage minus the voltage drop across those contacts...this is only a educated guess...when I see different components throwing DTC’s like this I suspect a voltage feed issue !!
Now I’m getting a p1153 code which I think might be just the heaters for the o2 sensors because they are also under that orange wire. I unplugged fuse 18 and connected my vom and it read 14.3v. What should I do now?
Do the procedure that I had instructed doing the voltage drop across the ignition switch !!...one voltmeter lead on battery positive and the other on fuse 18 with key ON or engine RUNNING !!...like I said you should only see .2 volts or so !!..this might be intermittent so it may be good one minute and bad the next !!
How EXACTLY are you hooking up your voltmeter ?!.... like I mentioned in my previous posts ??....if you are checking voltage at the fuse and you are dropping 8 volts it’s most likely the ignition switch...try the voltage drop test like I had suggested...a voltmeter doesn’t have to always be connected to power and ground !!...we are measuring from positive to positive performing this voltage drop...you may not fully understand what we are trying to do !!
In the picture I’m checking fuse 18 key ON...0.03 volts !!...if you are seeing 4 volts you only have 8 volts or so on that circuit...if you see 6 volts you are dropping half of the available voltage across the ignition switch !!...you most likely need a new switch !!
It was the ignition switch. I took it out and cleaned the contacts. Some were very black. Threw it back in and everything has worked so far. Thank you!
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Electrical problems all of a sudden
