Dash gauge Problem with my 2004 Chevy Trailblazer
4.2 six cylinder
ABS, seatbelt, battery, parking brake lights
GM Computer codes none
Repairs done prior = Installed aftermarket radio 4-5 months before problem
Repairs for this problem = rebuilt instrument panel cluster
GM tech = JK
question = All gauges in IPC are bottomed out except tach and speedo. ABS,seatbelt,battery,
and parking brake lights constantly stay on.
Cruise control works, but indicator light saying I am in cruise doesn't appear.
Also, the gear indicator light telling me if I am in P,R,N,etc.. doesn't highlight the gear I am in.
Had cluster rebuilt, problem still there.
1st question:
Could you possibly provide me with information that gives a pinout of my IPC harness and the
voltages that should be there.
2nd:
ECU location and the harness that goes to my IPC pinout with voltages.
I didn't make a donation because I wasn't sure if this information is available through this sight,
but I will gladly make one if it is.
JK:
After reading about the different problems with different seemingly unrelated indicators / gauges,
i looked through some schematics.
The thing that stands out is that then tach and speedo signal are given to the IPC from the PCM
from their own, seperate circuits. ALL the other indicators get their signal from the PCM, but on a
different circuit. In other words, all indicators are feed from the PCM to the IPC on 1 wire, called
the Class 2 serial data line. The speedo has its own wire, the tach has its own.
First be sure to check ALL fuses. Underhood fuse block, and block under the rear seat.
If all ok, i would suspect either a PCM problem, or more likely a problem with the serial data wire
between the PCM and the IPC.
A continuity check of that circuit is probably your best / next check.
4.2 six cylinder
ABS, seatbelt, battery, parking brake lights
GM Computer codes none
Repairs done prior = Installed aftermarket radio 4-5 months before problem
Repairs for this problem = rebuilt instrument panel cluster
GM tech = JK
question = All gauges in IPC are bottomed out except tach and speedo. ABS,seatbelt,battery,
and parking brake lights constantly stay on.
Cruise control works, but indicator light saying I am in cruise doesn't appear.
Also, the gear indicator light telling me if I am in P,R,N,etc.. doesn't highlight the gear I am in.
Had cluster rebuilt, problem still there.
1st question:
Could you possibly provide me with information that gives a pinout of my IPC harness and the
voltages that should be there.
2nd:
ECU location and the harness that goes to my IPC pinout with voltages.
I didn't make a donation because I wasn't sure if this information is available through this sight,
but I will gladly make one if it is.
JK:
After reading about the different problems with different seemingly unrelated indicators / gauges,
i looked through some schematics.
The thing that stands out is that then tach and speedo signal are given to the IPC from the PCM
from their own, seperate circuits. ALL the other indicators get their signal from the PCM, but on a
different circuit. In other words, all indicators are feed from the PCM to the IPC on 1 wire, called
the Class 2 serial data line. The speedo has its own wire, the tach has its own.
First be sure to check ALL fuses. Underhood fuse block, and block under the rear seat.
If all ok, i would suspect either a PCM problem, or more likely a problem with the serial data wire
between the PCM and the IPC.
A continuity check of that circuit is probably your best / next check.
