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.
Digital Sound System Control Module, Data Bus On Board Diagnostic Interface, Information Electronics Control Module 1
J525
Digital Sound System Control Module
J533
Data Bus on Board Diagnostic Interface
J794
Information Electronics Control Module 1
T12ac
12-Pin Connector, Gray
T17f
17-Pin Connector, Red
T17fx
17-Pin Connector, Red
T38a
38-Pin Connector, Black
T54
54-Pin Connector, Black
TALU
Coupling Point on Left A-Pillar, Bottom
A178
Infotainment CAN Bus High Connection (in Instrument Panel Wiring Harness)
A179
Infotainment CAN Bus Low Connection (in Instrument Panel Wiring Harness)
A225
Infotainment CAN Bus High Connection 2 (in Instrument Panel Wiring Harness)
A226
Infotainment CAN Bus Low Connection 2 (in Instrument Panel Wiring Harness)
E146
Connection 2 (CAN Bus Information Electronics Control Module 1, High)
E148
Connection 2 (CAN Bus Information Electronics Control Module 1, Low)
*
For Vehicles with Bang & Olufsen Sound System
*2
Refer to Applicable Communication Wiring Diagram
*3
Refer to Applicable Sound System Wiring Diagram
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.