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.
Circuit/System Verification
- Verify DTC B1987 did not set immediately following the replacement and programming of the K9 Body Control Module.
- If the DTC set immediately after the replacement and programming of the K9 Body Control Module
The immobilizer learn procedure was not properly completed. Perform the BCM immobilizer learn using the body control module IMMO Function with Existing Transponder or Remote Key in SPS. Refer to Immobilizer System Component Programming .
- Go to next step: If the DTC did not set immediately after the replacement and programming of the K9 Body Control Module
- If the DTC set immediately after the replacement and programming of the K9 Body Control Module
- Verify DTC B198A is not set in any of the control modules listed below:
- K45 Powertrain Control Module
- K36 Inflatable Restraint Sensing and Diagnostic Module
- K17 Electronic Brake Control Module
- K33 HVAC Control Module
- P16 Instrument Cluster
- K60 Steering Column Lock Module (if equipped)
- If DTC B198A is set in any of the modules
Refer to DTC B198A .
- Go to next step: If DTC B198A is not set in any of the modules
- Perform the K9 Body Control Module immobilizer learn using body control module IMMO Function with Existing Transponder or Remote Key in SPS. Refer to Immobilizer System Component Programming .
- Verify DTC B1987 does not set after programming.
- If the DTC sets after programming
Replace the K9 Body Control Module.
- Go to next step: If the DTC does not set after programming
- If the DTC sets after programming
- All OK.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.