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Appendix
65
DR Cable Wiring - For Dealer Installation Only (StreetPilot 2650 only)
The StreetPilot 2650 includes Dead Reckoning (DR) cable connections that must be installed by a Garmin-
authorized licensed installer. The DR connection consists of a 2-wire harness that connects to the VSS
(Vehicle Speed Sensor) and Reverse Light Switch on the bare wire end, and connects to the StreetPilot’s
vehicle adapter on the 2-prong molded connector end.
The Orange DR 1 cable wire attaches to the VSS. The unit software option Odometer Wave Type must be set
to either Square Wave or Sine Wave. This can be determined either by contacting the vehicle manufacturer or
by using an oscilloscope. Square Wave is the most common type. Do not connect the DR Cable into the
vehicle speed sensor signal from the ABS control.
The Green DR 2 cable wire attaches to the Reverse Light Switch. The unit software option Reverse Light
Polarity must be set to either High or Low. Contact the vehicle manufacturer for polarity or check with a
voltmeter. Set to High (most common) if a positive, high voltage is detected when the reverse lights are
illuminated. Set to Low if no or a low voltage is detected when the reverse lights are illuminated.
Appendix B: DR Cable Wiring
(2650 Only)
WARNING: the terms of the Garmin
Warranty require that the DR (Dead
Reckoning) Cable with bare wire
leads be installed by Garmin-autho-
rized licensed installers. The user
should not attempt installation.
DR 1
DR 2
DR 1 - ORANGE
DR 2 - GREEN
Do NOT cut or splice the cable
between the limiter and plug.
OK to cut or splice
past limiter.
Interface Tab (2650 Only)
Attaching the Dead Reckoning Cable to the Vehicle Adapter (StreetPilot 2650 only)
1. Locate the DR connector on the side of the vehicle adapter. The connector is “keyed” with a large and
small receptacle.
2. Mate the DR plug to the connector on the vehicle adapter and push the plug into the connector until
fully seated.