User Login    
 + Register
  • Main navigation


Lost Password?

Register now!
Fast Search
Slow Search
Google Ad

[Datsun 1200 encyclopedia]

Wiper Wiring

From Datsun 1200 Club

Datsun 1200 encyclopedia | Recent changes | Edit this page | Page history | Switch to MediaWiki mode

Printable version | Disclaimers | Privacy policy
Category: Wiring

The wiper switch does not have a hot wire. It only serves to connect various circuits to ground (earth). 12V is supplied to both the wiper motor and washer motor by the same fuse whenever the key is turned to IGN.


Wiper Motor


When the ignition switch is turned to IGN, the wiper motor is always supplied with 12V. When it is in the PARK position (wipers at bottom of windshield) an internal cam breaks the ground circuit. The motor will not turn until GROUND is supplied by pulling the wiper switch knob.

Basic test: LR wire (blue/red) should always read 12V when when IGN is on.

When the wiper knob is pulled out to the first position, the low-speed motor wire is grounded, so the motor turns slow speed. When pulled out to position 2, the high-speed wire is grounded. When the knob is pushed all the way in, the motor continues turning until the PARK cam breaks the ground circuit.

Motor Wires

The motor itself has four wires:

  • From connector, going into motor housing:
    • Blue: Low speed ground
    • Blue/White: High speed ground
    • Blue/Red [detachable]: Hot wire (12V) from IGN fuse
    • NOTE: Blue wires may fade to a greenish color.
  • Black: connector to case earth/ground


  • The yellow wire is internally connected to the parking circuit, there is no external wire for this on the motor.

Bench Testing

Bench testing a wiper motor is easiest if you have a spare motor connector cut from an old wiring harness.

  1. NOT TESTED, let us know if this works!
  2. Plug connector to motor
  3. Connect LR (Blue/red) wire to Battery POS
  4. Connect a jumper wire (spare wire) to Battery NEG
  5. Touch ground jumper wire to L (Blue) wire on connector
    • No turning: Defective motor
    • Turns: Continue testing
  6. Touch ground jumper wire to LW (Blue/White) wire on connector
    • No turning: Defective motor
    • Turns faster: Continue testing
  7. Touch ground jumper wire to B (black) wire on connector
    • No turning: Defective motor
    • Turn to certain postion and stops: Good

Windshield Washer

The Kangaroo Bag washer motor is grounded through the dashboard wiper switch. Twist the wiper knob to supply GROUND to the washer motor. 12V is supplied through the Fuse Box, always when the ignition switch is turned to IGN.


  1. Turn key to IGN
  2. Use voltmeter, put NEG cable to battery NEG terminal
  3. At washer bag, unplug LR (blue/red) wire, and check for 12V
    • 12V found: continue testing
    • 12V not found. Stop and check Fuse Box
  4. Reconnect LR wire
  5. Ensure water is in the bag
  6. Disconnect BL (black/red) wire and connect a spare wire from the bag to the cylinder head bare metal
    • Motor hums/squirts: It's OK
    • No sounds: Bad motor

If the motor hums when jumped to EARTH, but nothing happens when you twist the dash knob:

  1. Have an assistant twist the dash knob while you listen up front
    • No hum: Wiper switch is bad OR loose wiring connection
    • Motor hums: Test the fluid hose for blockage.

Test Hose for Blockage

  1. Disconnect washer hose from underside of hood/bonnet
  2. Ground the motor per above
    • Washer fluid comes out hose: Squirter on hood is probably blocked. Stick a sewing pin or needle in the ports. Try again

Bench Testing

  1. Fill the Kangaroo Bag partially with water to prevent burning the pump by running it dry
  2. You will find two wires at the bottom of the Kangaroo Bag.
    Connect BL (Black/red) wire to Battery NEG
    Connect LR (Blue/red) wire to Battery POS
    • It should squirt water if the pump is working

Photo Index

14616.jpg 5459.jpg 19671.jpg

Retrieved from ""

This page has been accessed 22,608 times. This page was last modified 03:24, 15 November 2012. Content is available under Datsun 1200 Club.