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Wiper Switch Test

Wiper switch is incorporated within steering column combination switch. Remove lower instrument panel cover below steering wheel. Locate and unplug combination switch connector that is mounted to instrument panel brace, left of steering column. See appropriate COMBINATION SWITCH CONNECTOR TERMINAL IDENTIFICATION table.

COMBINATION SWITCH CONNECTOR TERMINAL IDENTIFICATION (190E SERIES) (1)

Terminal Wire Color Function
2 Black/Blue/Purple Wiper Low Speed
4 Black/Blue/Green Wiper High Speed
7 Black/Yellow (2) Wiper Parking & Voltage To Combination Relay
11 Purple/Yellow To Headlight Washer Relay & To Wiper Washer
13 Black/Yellow/Purple (2) Intermittent Wiper Voltage To Combination Relay
(1) Information was not available for other terminals not specified in this table.
(2) Flasher is a part of combination relay. Combination relay combines functions for turn signal flasher, heated rear window timer, and intermittent wiper into one relay. Relay is located in engine compartment relay box.
COMBINATION SWITCH CONNECTOR TERMINAL IDENTIFICATION (300 SERIES)

Terminal Wire Color Function
1 White/Yellow Dimmer Switch Voltage
2 White High Beam Flash/Passing
3 Yellow Low Beam
4 Black Horn Voltage
5 Black/Pink/Red To Horns
6 Black/White Left Turn Signal
7 Black/Gray/White (1) Voltage From Flasher
8 Black/Green Right Turn Signal
9 Black/Brown (1) Wiper Parking & Voltage To Combination Relay
10 Purple/Yellow Windshield Washer
11 Black/Yellow Ignition Voltage Input
12 Black/Yellow/Gray Wiper Low Speed
13 Black/Yellow/White Wiper High Speed
14 Black/Yellow/Purple (1) Intermittent Wiper Voltage To Combination Relay
(1) Flasher is a part of combination realy. Combination relay combines functions for turn signal flasher, heated rear window timer, and intermittent wiper into one relay. Relay is located in engine compartment relay box.
COMBINATION SWITCH CONNECTOR TERMINAL ID (350 SERIES, 420SEL & 560 SERIES)

Terminal Wire Color Function
1 White/Yellow Dimmer Switch Voltage From Terminal No. 56 Of Light Switch
2 White High Beam Flash
3 Yellow Low Beam
4 Black/Purple Horn Voltage From Fuse Block
5 Black/Pink/Purple To Horns
6 Black/White Left Turn Signal
7 Black/Gray/White (1) Voltage From Flasher
8 Black/Green Right Turn Signal
9 Black/Brown/Yellow (1) Intermittent Wiper Voltage To Combination Relay
10 Gray (1) To Windshield Washer Pump & To Combination Relay
11 Black/Yellow Ignition Voltage Input
12 Black Wiper Low Speed
13 Blue Wiper High Speed
(1) Flasher is a part of combination relay. Combination relay combines functions for turn signal flasher, heated rear window timer, and intermittent wiper into one relay. Relay is located in engine compartment relay box.
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