Radio not working question ??

[fonz87]

When i bought my supra, the engine was in a fire, and something shorted out the radio since it's not working, also the side mirrors aren't working.
So here is my question, how can i trouble shoot this,
I already checked the Fuses, everything is fine. I looked at the wiring diagram and from what i see, the wires connected to the radio, it's also connected to the side mirrors. I m not sure where to locate this in the car but if someone knows on how i can trouble shoot this, i appreciate it


thanks

 

[3p141592654]

You need to remove the radio and disconnect the power plugs. Then start by checking for power and ground on the relevant pins.
+B should have 12V all the time
ACC should have 12 V with the ignition on or in accessory position
GND shoul d be low resistance to ground

The rest are don't care for now.

This from Ishii on that other site:

The connections you should be looking at are the ones Labeled 10pin and 6pin.

Here is the wiring pin out of the 10pin connector:

1: FR+
2: FL-
3: ACC
4: +B
5: FR-
6: FL-
7: GND
8: ANT+
9: AMP+
10: ILL+

Here is the 6pin connector pinout

1: RR+
2: RL+
3: RR-
4: (usually unused)
5: LL-
6: RL-

By the way, the original factory radios are way past their prime and often have internal problems. This may be the case here.

 

[fonz87]

thank you, ill try to pull the radio out and check. Even if the radio is bad, the side mirrors still dont work ??

 

[3p141592654]

Is this a JDM car? Not sure what you mean by the mirrors not working. The UDM cars do not have power folding mirrors, although they do have defrosters.

 

[pogoism9]

power mirrors....

 

[3p141592654]

Oh yeah, forgot about those, must be getting senile. :aigo:

For 89+, the following is true, not sure about 86-88:

Left kick panel is a 7.5A fuse they both share (E1). Also, there is a big junction box with 3 connectors from cowl wire to instrument panel wire (E3).

http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=28

Stick a voltmeter on the gray wire on connector 3A pin 12 with ign on and should see 12 V there if fuse and power supply circuit is okay. That circuit feeds the radio and power mirrors.

http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=20