u1000 class 2 serial communication problem

#U1000 CLASS 2 SERIAL COMMUNICATION PROBLEM CRACKED#
#U1000 CLASS 2 SERIAL COMMUNICATION PROBLEM MOD#

U1152 - lost communication w HVAC control system ī1440 - Power mode master input circuit mismatch ī2600 - passenger compartment dimming 1 circuit. U1096 - lost communication w/ driver info and display control system (IPC) Other present DTC's before the circuit mod: Another words, the touch of the hand to the IPC may somewhat affect the board's relative capacitance (a hypothesis). If the wire is not at fault, then it may be a a faulty input capacitor on the circuit board. This is why I'd like to check the wire's continuity, that feeds the serial data. In those instances when it fails, just a touch to the wire loom or plug, is all it needs to nudge it into operation.

#U1000 CLASS 2 SERIAL COMMUNICATION PROBLEM MOD#

With the circuit mod there appears to be more repeatable IPC wake-ups in freezing weather.

#U1000 CLASS 2 SERIAL COMMUNICATION PROBLEM CRACKED#

With the last scenario I figured the pcb might have a cracked circuit lead, so I added redundant wire feeds onto the circuit board, starting from the pin harness, see photos.Ĭlass2SerialShroudedRed.jpgThe wire lead with red insulation is the serial input feed. Other times it may be necessary to flex the plug. When its freezing cold, and the IPC doesn't wake until one just touches the plug or sometimes just its wire bundle. The intention is too check the internal resistance of the wire feed that caries the Class2 serial data. Another important thing to consider if the PCM lost coms with the PCM it should have set an IPC code for loss of coms with pcm if it didn't then definately gotta be an issue with the ipc itself good luck and a little more info i am sure I can walk you through troubleshooting this. One important thing to remember is that if you use the scan tool and check for codes in the other modules (bcm, ipc, chassis/abs) you can narrow down the cause every module shares the sam data link so if you find a loss of communications with the ipc in any other modules the problem is likely a int. Another thing to check is the harness grounds and if this vehicle has an aftermarket theft deterent or remote start they could be causing it also. I don't know what or why you are wanting to follow this wire, but if it is for the purpose of troubleshooting the U1000 code you might look real closely at the ignition switch I have seen them lose one circuit in the crank position and cause this code.

U1000 class 2 serial communication problem