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• Knocking sounds are coming from under the vehicle.
The magnet is hitting the vehicle or mounting bracket while rotating. Inspect the
sensor installation and reinstall as needed. See "Sensor Installation" on page 10.
• Current Readings are zero but everything appears properly installed.
You may have loose or poor connections and/or a broken wire inside of wire
insulation. Use "Sensor Wire Continuity Test" on page 23 to locate problem
wiring. Tighten crimps and/or replace wire.
S
W
C
ENSOR
IRE
1. Unplug harness cable.
2. Use an multimeter or continuity tester to probe Pins 2 and 3 on the harness
connector.
• Pin 1: Unswitched +12V
• Pin 2: Sensor Signal
• Pin 3: Ground
• Pin 4: Unused
Figure 30: Position of Pins on Harness Connector
3. Roll vehicle forward.
Multimeter or continuity tester should indicate a short each time the magnet
passes the sensor tip. If so the sensor is operating properly
4. If no short is indicated, check the wiring carefully for breaks or loose
connections. Probe between the white wire of the harness cable as it enters the
butt connectors and Pin 2. Probe between the black wire of the harness cable as
it enters the butt connectors and Pin 3.
The multimeter or continuity tester should indicate a short. If so the harness
cable is unbroken.
5. Check the butt connectors carefully for loose connections by probing across the
butt splice for the white wires and then across the butt splice for the black
wires.
The multimeter or continuity tester should indicate a short. If so the butt con-
nectors are properly crimped. If not, tighten crimps or replace crimps (two extra
butt connectors were provided with your DriveRight).
6. Check the sensor wires for nicks or other signs of damage, remove and replace
suspect sections, use 22 AWG UL1015 (105C) wire with 22-18 AWG insulated
(red) butt connectors available at your local hardware store.
T
ONTINUITY
EST
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