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Home >> Mercedes Benz >> 2000 >> ML430 >> Repair and Diagnosis >> Body & Frame >> Ignition Switch/Steering Lock >> Anti-Theft & Central Locking System -- 163 Chassis >> Self-Diagnostic System >> CL test of electrical system motor actuation relay - AD80.20-P-6001-43GH

CL test of electrical system motor actuation relay - AD80.20-P-6001-43GH

HAND-HELD TESTER Scope of test Measuring instrument/Test connection Operation/Requirement Specified value
  • Possible cause/Remedy
1.0  Central locking locks everything 
HHT actuation
HAND-HELD TESTER All doors closed and unlocked. All doors and fuel tank flap are locked
  • Individual doors are not locked:

    1.1

  • No door is locked:

    1.2

1.1  Central locking unlocks everything 
HHT actuation
HAND-HELD TESTER All doors closed and locked. All doors and fuel tank flap are unlocked
  • Left front door and fuel tank flap are not unlocked:

    1.3

  • Right front door and rear doors are not unlocked:

    1.4

  • Tailgate is not unlocked:

    1.5

  • No door is unlocked:

    Cables, N10

1.2  Central locking relay, lock all doors (F1k20) 
Function
  Replace relay (F1k20) by relay (F1k15),
Repeat test 1.0
All doors and fuel tank flap are locked If test 1.0 in order:
  • Relay (F1k20) otherwise:
  • Cables
1.3  Central locking relay, unlock left door and fuel tank flap (F1k24) 
Function
  Replace relay (F1k24) by relay (F1k15), close and lock left front door
HAND-HELD TESTER Actuation of unlocking left front door.
Left front door is unlocked Value in order:
  • Relay (F1k24)

    Value not in order:

  • Cables
1.4  Central locking relay, unlock right door and rear doors (F1k23) 
Function
  Replace relay (F1k23) by (F1k15), repeat test 1.1 All doors and fuel tank flap are unlocked If the same fault pattern emerges when test 1.1 is repeated:
  • Cables
  • All-Activity Module (AAM) (N10)

    Tailgate is not unlocked:

  • Relay (F1k23)
1.5  Central locking relay, unlock tailgate (F1k15) 
Function
  Replace relay (F1k15) by (F1k23), close and lock tailgate
HAND-HELD TESTER Actuation of unlocking tailgate
Tailgate is unlocked Value in order:
  • Relay (F1k15)

    Value not in order:

  • Cables