ELECT-23, Alarm System - Bypassing


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Introduction

Sometimes engine starting and running problems can be caused by a faulty alarm module (if the car is equipped with an alarm system). Since testing the alarm module is difficult at best, bypassing the alarm system to see if the car will start is the next best thing. This requires disconnecting the alarm module and installing two jumpers in the electrical connector plug.

Tools

Procedure

  1. First, locate the alarm module. It's a black box approximately the size of a pack of cigarettes. On early 944s (pre-1985.5), it's located behind the radio in the back of the center console. On late model 944s, it's located behind the kick panel in the passenger's footwell near above the DME computer.
  2. Disconnect the electrical plug from the alarm module.
  3. Connect one jumper from Pin 1 to Pin 4 on the large module connector. Connect the second jumper from Pin 7 to Pin 8 on the large module connector.

    Alarm Module Connector Pins
    Late 944 Alarm Module - 911.637.104.02
    Plug Terminal #
    Wire Color
    Control Unit Terminal #
    1
    Black / White (0.5 mm)
    15
    2
    Brown / Yellow (0.5 mm)
    T
    3
    Brown (0.5 mm)
    31
    4
    Green (0.5 mm)
    87a
    5
    Yellow (0.5 mm)
    E/A
    6
    Brown / Black (0.5 mm)
    MK
    7
    Yellow / Red (0.5 mm)
    61
    8
    Blue (0.5 mm)
    61
    1 (small plug)
    Black / Red (1.0 mm)
    HN
    2 (small plug)
    Red (1.5 mm)
    30

    Early 944 Alarm Module - 911.637.104.00
    Plug Terminal #
    Wire Color
    Control Unit Terminal #
    1
    Green
    15
    2
    Brown (2 wires)
    T
    3
    Brown / White
    31
    4
    Black
    K1
    5
    Blue
    E/A
    6
    Blue / White
    MK
    7
    Brown / Black
    61
    8
    Brown / Red
    61
    1
    Red / Yellow
    HN
    2
    Red
    30

    Late Alarm Module Wiring Diagram

  4. Attempt to start the vehicle to verify that the alarm bypass was successful. If the jumpers were installed to troubleshoot a "no start" condition and the car still does not start, the alarm module is not the problem.

Clark's Garage 1998