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Home >> Mercedes Benz >> 1998 >> SL500 >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Pneumatically Controlled Systems >> System Tests >> Central Locking >> Test 12: Vehicle Speed Activation Signal
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Test 12: Vehicle Speed Activation Signal

  1. On SL500, go to next step. On CL500, S320, S420, S500, go to step 3).
  2. Using Harness Adapter (202 589 16 63 00), connect Breakout Box (129 589 00 21 00) to Pneumatic System Equipment (PSE) control module. Measure voltage between ground and terminal No. 64 at breakout box. Turn ignition switch to RUN position. Raise and support vehicle so drive wheels can be turned. Rotate left front wheel. If approximately 5 volts exists, vehicle speed activation signal is okay at this time. If approximately 5 volts does not exist, check the following as possible cause and repair as necessary:
  3. Using Harness Adapter (140 589 13 63 00), connect Breakout Box (129 589 00 21 00) to Pneumatic System Equipment (PSE) control module. Measure voltage between ground and terminal No. 10 at breakout box. Turn ignition switch to RUN position. Raise and support vehicle so drive wheels can be turned. Rotate left front wheel. If approximately 5 volts exists, vehicle speed activation signal is okay at this time. If approximately 5 volts does not exist, check the following as possible cause and repair as necessary:
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