Dash cluster dead, no a/c, and no aftermarket parts were installed. tried replacing main ecu, and also multiplex system located in interior fuse box, and still no fix! any suggestions?
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First thing, check fuse box...all of them, as many new vehicles have more than one. If the fuse for the dash lights is good, turn your attention to the dash light dimmer switch. That has been the culprit for me a couple of times. If it's mounted in the dash, and not in the gauge cluster, then it's easy to replace. One question, did you recently install an aftermarket stereo? If so, did you hook up the "Dimmer" wire? That often shorts the dimmer switch...or in the case of my Honda Accord, the multiplex computer on the drivers side. What make/model/year is your vehicle? That would be helpful in trying to diagnose.
Here's how it should work: Power for the instrument panel comes from the 7.5A ECU-B fuse in the instrument panel junction box (I/PJB). A WHT/BLK wire from the instrument panel is grounded in that box. The I/PJB also contains a 5A WARNING fuse which is connected to the instrument panel by a RED/YEL wire. The 5A BKUP LAMP fuse supplies power on a RED/BLU wire to the vehicle speed sensor (combination meter) and a LT GRN wire from sensor is connected to the instrument panel. In addition, a LT GRN/RED wire from the instrument panel connects to the ECM. The YEL/GRN and RED/BLU wires from the instrument panel connect to the body ECU. There are three ground wires: two WHT/BLK and one BRN
The timing chain should not routinely need changing, but perhaps the tensioner does. Try first to eliminate any other causes, like the bearings in the fan, drive belt idlers, or alternator. A useful tool is a long screwdriver which you can apply to the various areas while placing your ear to the top of it while the motor idles. Be very careful to keep clear of moving parts like fan blades.
I dont think there is a factory amp in your car i might be wrong but, if it is aftermarket check under seats, or behind glove box beside computer... according to the wiring schematic i have it said different ...notice were is states location of amp and trigger. 2000 Toyota Celica Car Stereo Radio Wiring Diagram
Car Radio Constant 12v+ Wire: Blue/Yellow
Car Radio Switched 12v+ Wire: Gray
Car Radio Ground Wire: Brown
Car Radio Illumination Wire: N/A
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger: Black
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Front Speakers Size: N/A
Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Pink
Left Front Speaker Negative Wire (-): Violet
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Blue
Rear Speakers Size: N/A
Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Black
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Red
Right Rear Speaker Negative Wire (-): White