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Ask Don 'Mo Lurch' Your Own Que...
Don 'Mo Lurch'
Don 'Mo Lurch', Toyota Mechanic
Category: Toyota
Satisfied Customers: 20958
Experience:  Heavy Line Mech-, Mobile Electronics. Sales, Installation & Repair for 30 years. R/S, etc.
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I am trying to diagnose electrical problem with front

Customer Question

I am trying to diagnose electrical problem with front passenger side window. I have tested the motor with 12 V battery. It works.

I have tested the juice throughout. It goes all the way to the connector and I am able to run the motor by connecting wires from the last connector to the motor and then pushing the window buttons up and down.

However, when I snap the male and female connectors together then the juice does not flow through. What else to check/do to get the window mechanism working?

Submitted: 1 year ago.
Category: Toyota
Expert:  Don 'Mo Lurch' replied 1 year ago.


sorry for the delay............
Greetings...... “Hi, I’m Don (aka MOLurch) and I look forward to helping you!”
You need to test as below to isolate the issue:

Use of a VOM is needed to test
The way it works:
Ignition On
Switch held in Up position
One wire will have 12 Volts +
One wire will have Ground -

Switch held in Down position
The wire that had 12 Volts + is now Ground -
The wire that was Ground - is now 12 Volts +

If Voltage or Ground checks good at motor, replace motor.
If Voltage or Ground does not check good:
Check Switch Voltage & Ground.
Check for broken wires at Door / Kick Panel Boot

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Customer: replied 1 year ago.

I have already tested what you suggested above before writing my question on JA.

What else to check?

Expert:  Don 'Mo Lurch' replied 1 year ago.

IF you followed the exact above, then you should have come to a conclusion........
You either have "Reversal" Positive & Ground "at the Motor or not
IF you do, the Motor & / or the Regulator is bad
IF you do NOT, then you have to test at the Incoming of the Switch for Ground & Positive.
IF there is NOT either / or, then broken wires at Door jamb or Ground or Positive in the cab / fuse panel.
IF there is Ground & Positive to the Switch, & NO output from the Switch, replace the Switch
It is not that difficult of a wiring test to pinpoint

Customer: replied 1 year ago.

Sorry. You did not provide any actionable suggestion that I had not explored already. I ended up taking it to a mechanic.

Expert:  Don 'Mo Lurch' replied 1 year ago.

sometimes that is best
and the mechanic found?

Customer: replied 1 year ago.

He found some wiring issues that he did not elaborate much in detail.

Expert:  Don 'Mo Lurch' replied 1 year ago.

thanks for the response..........

many times it is difficult to respond "exactly" of how to "pinpoint" problems without hands on.
We can only post to what the customer posts
Sorry you were not able to tackle it yourself, glad you got it done

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