Test point 15

Central locking signal

• Ignition on
• Vehicle not locked

PST2 display: not present

• Central locking button actuated
• Vehicle locked

PST2 display: present

• Read out fault memory in alarm system control module and eliminate faults present

If the central locking function is OK

• Switch off ignition
• Pull off plug II on the instrument cluster
• Lock vehicle
• Ohmmeter on plug II of instrument cluster pin 8 and ground

  Ohmmeter display: < 5 Ω

• Unlock vehicle
• Pull plug I off the alarm system control module
• Ohmmeter on instrument cluster plug II pin 8 and plug I on alarm system control module pin 30

  Ohmmeter display: < 5 Ω