Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Control Module for Emergency Call Module and Communication Unit -J949-, REPLACING
Control Module for Emergency Call Module and Communication Unit -J949-, Replacing and Adapting
- Current data for the "Guided Fault Finding"
-- Select the Replace control module function on the Vehicle Diagnostic Tester in the Guided Fault Finding or Guided Functions mode for the Control Module for Emergency Call Module and Communication Unit -J949-.
-- Remove the Control Module for Emergency Call Module and Communication Unit -J949-. Refer to Control Module for Emergency Call Module and Communication Unit -J949-, REMOVING AND INSTALLING .
-- Install the new Control Module for Emergency Call Module and Communication Unit -J949-. Refer to Control Module for Emergency Call Module and Communication Unit -J949-, REMOVING AND INSTALLING .
-- Select the Coding function on the Vehicle Diagnostic Tester in the Guided Fault Finding or Guided Functions mode for the Control Module for Emergency Call Module and Communication Unit -J949-.
-- Select the Adapting to Immobilizer function on the Vehicle Diagnostic Tester in the Guided Fault Finding or Guided Functions mode for the Control Module for Emergency Call Module and Communication Unit -J949-.
-- Select the Activating function on the Vehicle Diagnostic Tester in the Guided Fault Finding or Guided Functions mode for the Control Module for Emergency Call Module and Communication Unit -J949-.
-- Exit Guided Fault Finding or Guided Functions .
-- Switch off the ignition.
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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