Bought a Fabia with an airbag light on. Scanned it for faults under airbag and it won't communicate with the diagnostics at all.

Scanning under engine management I get the fault...

"P1636 Data Bus Powertrain: missing message from airbag control"

And under a different section, can't remember which one but I get this fault...

"Control unit for airbag-j234 no communication"

I removed the drivers airbag before to check incase it wasn't plugged in for whatever reason but all seems fine I guess.

Anyone?

The probable causes are:

 

• SRS control module trouble codes stored,
• Wiring
• matching resistor in ecm

 Before getting too far I would check the relevant fuses.

 

Also, have you searched for this error code on the 'net?

 

SN

18044/P1636/005686

Contents

• 1 18044/P1636/005686 - Powertrain Data Bus: Missing Message from Airbag Controller
  • 1.1 Possible Symptoms
  • 1.2 Possible Causes
  • 1.3 Possible Solutions

18044/P1636/005686 - Powertrain Data Bus: Missing Message from Airbag Controller Possible Symptoms

• Malfunction Indicator Light (MIL) ON

Possible Causes

• Fuse(s) faulty
• Databus Wiring and/or Connector(s) from/to Airbag Control Module (J234) faulty
• Airbag Control Module (J234) faulty

Possible Solutions

• Check Fuse(s)
• Check Databus Wiring and/or Connector(s) from/to Airbag Control Module (J234)
• Check/Replace Airbag Control Module (J234)
  • Check Measuring Value Blocks (MVB)

 

Coutresy of RossTech.

Thanks for that. I've checked the wiring to the drivers airbag but not the passenger side.

I'm guessing the airbag control module is built into the airbag itself?