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finding the wait-to-start bulb wire for diesels
In diesel vehicles it is necessary to interface with the wire that turns on the WAIT-TO-START light in the dash-
board. This wire illuminates the bulb until the vehicle's glow plugs are properly heated. When the light goes out
the vehicle can be started. This wire is always available at the connector leading to the bulb in the dashboard.
It can also be found at the Engine Control Module (ECM) in many vehicles.
To test and determine the polarity of this wire:
1. Set your multimeter to DCV or DC voltage (12 or 20V is fine).
2. Attach the (+) probe of the meter to (+)12V.
3. Probe the wire that you suspect leads to the bulb with the (-) probe of the meter.
4. Turn the ignition switch to the ON position.
5. If the meter indicates 12 volts until the light goes out you have isolated the correct wire and the wire's polar-
ity is negative (ground while the bulb is on).
6. If the meter reads zero volts until the light goes out and then reads 12 volts, you have isolated the correct
wire and the wire's polarity is positive.
primary harness (H1) wiring diagram
______
H1/1
______
H1/2
______
H1/3
______
H1/4
______
H1/5
______
H1/6
______
H1/7
______
H1/8
© 2000 Directed Electronics, Inc. Vista, CA
BLACK
WHITE/BLUE
LIGHT GREEN/BLACK
YELLOW
WHITE
GRAY/BLACK
LIGHT GREEN
LIGHT BLUE
(-) CHASSIS GROUND INPUT
(-) FACTORY DISARM/SPECIAL ACCESSORY
(+) IGNITION (OUTPUT TO SECURITY SYSTEM)
(-) 200 mA LIGHT FLASH OUTPUT
(-) WAIT-TO-START INPUT
(-) 200 mA DOOR LOCK OUTPUT
(-) 200 mA DOOR UNLOCK OUTPUT
(-) ACTIVATION INPUT
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