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Old 04-20-2014, 05:01 PM
Zacharias's Avatar
Not so amused
Join Date: Apr 2010
Location: West Quebec
Posts: 4,025
How to read pin (connector) test instructions?

I started to test my climate control servo (ACC II system).

The first tests call for unplugging the electrical multi-pin connectors and testing the servo pins.

How am I supposed to read them? There is no numbering on the servo or connector?

I am looking from above, with the unit in the car.

Is 1, 2, 3 etc from left to right from above, or assuming I had the servo in my hand and was looking at the pins straight-on? (In other words, backwards if seen from above?)

Other times I have done this stuff it was on Bosch connectors, which are usually numbered... or the manual has indicated the wiring colours to the pins in question... so have never been aware of the rule.

I ask as one test involves applying 12v to some pins and I don't want to do it wrong.

2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

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Old 04-20-2014, 06:09 PM
Control Freak
Join Date: Oct 2011
Location: Columbia, SC
Posts: 3,234
Here is the link to the Chrysler manual for this system.

1971 Chrysler Imperial Auto-Temp 2 Service Reference Guide - Session 281

There is a diagram in the back.
2014 ML350 Bluetec (wife's DD)
2008 E320 Bluetec (my DD)
2008 ML320 CDI (Older son's college DD)
1998 E300DT (Younger son's college DD)
1987 300TD sold to vstech
gone but living on
1983 240D (body to greazzer, engine to t walgamuth)
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