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Home >> Mercedes Benz >> 1998 >> SL500 >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Pneumatically Controlled Systems >> System Tests >> Remote Trunk Release >> Test 1: Remote Trunk Release Switch Test
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Test 1: Remote Trunk Release Switch Test

  1. Unlock trunk with key. Close trunk. Press remote trunk release switch. If trunk opens, system okay at this time. If trunk does not open, check wiring. See WIRING DIAGRAMS . If wiring is okay, check the following as possible cause and repair as necessary:
    • Go to next step.
    • Perform TEST 2: REMOTE TRUNK RELEASE SWITCH ILLUMINATION.
    • Perform remote trunk release vacuum TEST 1: REMOTE TRUNK RELEASE SYSTEM PRESSURE TEST. See REMOTE TRUNK RELEASE under VACUUM SYSTEM TESTS .
    • Perform pneumatic system vacuum TEST 12: REMOTE TRUNK RELEASE PRESSURE SUPPLY. See PNEUMATIC SYSTEM EQUIPMENT under VACUUM SYSTEM TESTS .
    • Suspect faulty PSE control module.
    • Repair mechanical fault.
  2. On SL500, go to next step. On CL500, S320, S420 and S500, go to step 4).
  3. Disconnect PSE control module harness connectors. Using Harness Adapter (202 589 16 63 00), connect Breakout Box (129 589 00 21 00) to Pneumatic System Equipment (PSE) control module harness connectors. Measure voltage between terminals No. 7 and 9 at breakout box. When remote trunk release switch is press, battery voltage should exist. When remote trunk release switch is not pressed, less than one volt should exist. If voltage is as specified, remote trunk release switch circuit is okay at this time. If voltage is not as specified, check wiring. See WIRING DIAGRAMS . If wiring is okay, replace remote trunk release switch.
  4. Disconnect PSE control module harness connectors. Using Harness Adapter (140 589 13 63 00), connect Breakout Box (129 589 00 21 00) to Pneumatic System Equipment (PSE) control module harness connectors. Measure voltage between positive battery voltage and terminal No. 58 at breakout box. When remote trunk release switch is press, battery voltage should exist. When remote trunk release switch is not pressed, less than one volt should exist. If voltage is as specified, remote trunk release switch circuit is okay at this time. If voltage is not as specified, check wiring. See WIRING DIAGRAMS . If wiring is okay, replace remote trunk release switch.
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