1993 BMW 740iFACTORY OEM SERVICE PROCEDURE

ACCEL Mode Does Not Work

  1. Disconnect cruise control unit wiring harness connector. Connect voltmeter leads to terminal No. 4 and ground. Turn control switch to ON position. Move cruise control switch to ACCEL. If no voltage is present, go to step 3).
  2. If 12 volts are present, release cruise control switch. If voltage drops to zero, replace cruise control unit. If voltage does not drop, check circuit between cruise control unit terminal No. 4 and cruise control switch terminal No. 3. If necessary, repair wire. If wire is okay, check cruise control switch. See COMPONENT TESTING.
  3. Connect voltmeter leads to cruise control switch terminal No. 3 and ground. Turn control switch to ON position. Move cruise control switch to ACCEL. If no voltage is present, replace cruise control switch. If 12 volts are present, repair circuit between cruise control unit terminal No. 4 and cruise control switch terminal No. 3.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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