No display at Cab Command in Supra 922

[reeferj]

Hi, guys, I need help again. There is a unit Supra 922, no display at the Cab Command. I have checked these below:

1. All Fuses are good, especially the Fuse 2.

2. There is power 13.5DV at the connector behind the cab command, and the ground wire shows a good continuity.

3.There is power at RCR Relay at 30 and 86 terminal, relay is good, also switched around relay on the relay board.

4.There is power 12DV coming at the white wire coming from terminal 30, then to the plug behind the Cab Command.

5.Took the Cab Command off from Supra 922, then installed it to the Supra 422, it worked. But as I put it back to Supra 922, still no display.

So what is the problem? feel so depressed..........

[reeferj]

oh, no one knows about this?

[Robert Hilton]

Check the power supply to the micro P board (I think it has a power feed direct from the battery) otherwise I fear the board is defective.

[reeferj]

Check the power supply to the micro P board (I think it has a power feed direct from the battery) otherwise I fear the board is defective.

Which wire is the power supply to the MP? On the diagram, it said L1 terminal on the MP, but didnt say which wire!

[clivemtk]

try the engineer switch at the rear of control box is not switched to off position

[reeferj]

Thanks Clivemtk, that switch is at ON position.

[Robert Hilton]

The wires are identified on the diagram. It is also stamped into the wire at regular intervals.

[moggy66]

Thanks Clivemtk, that switch is at ON position.

Is there voltage thru this switch?

[reeferj]

Hey, guys, this problem was fixed. The problem was at the wire to the RCR relay, which was loosed............