Scania LAS DTC 18 Extra sensor 1

LAS Locking and Alarm System · Scania

Code 18 (decimal). Some diagnostic tools show it in hexadecimal as 0012.

In short

The voltage on the alarm control unit input has been below 3 V.

Applies to: LAS1

What does Scania LAS fault code 18 mean?

The voltage on the alarm control unit input has been below 3 V.

What causes Scania DTC 18?

The fault can be caused by the following: – Short circuit to ground in the sensor. – Short circuit in the cable harness between the alarm control unit and the sensor.

How does the system react?

The fault code is set when the starter key is turned to the lock position. When the alarm is activated via the remote control, the fault is indicated as follows: – The LED flashes rapidly for 5 seconds. – There is no acknowledgement signal from the siren. The sensor can be deactivated using Scania Programmer.

How to fix Scania LAS fault code 18?

  1. 1.
  2. Check the sensor, harness-to-harness connector and cable harness.
  3. 2.
  4. Disconnect harness-to-harness connector C241.
  5. 3.
  6. Check that the resistance is infinite when the sensor is open.
  7. 4.
  8. Check that the resistance is 900 – 1,100 ohms when the sensor is closed.
  9. 5.
  10. Check that the voltage on pin C241-1 is higher than 9 V.
  11. If the voltage is too low: check that the cable harness to the alarm control unit is not short-circuited to earth.
  12. 6.
  13. Check that pin C241-2 is connected to earth via the alarm control unit.

This information is for guidance only. Always follow the manufacturer workshop manual and safety procedures; if in doubt, contact an authorised workshop.

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