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.
Driver Information Module (DIM) Signal Description
All the values given below are measured between the respective connection in column 1 and connection 14 (signal ground) if not otherwise specified.
It is important that the test box is connected and the ground points checked before testing begins.
| U = | DC voltage (V) | f = | frequency in Hertz (Hz) |
| Ubat = | battery voltage (V) | t = | period time in milliseconds (ms) |
| Ulow = | Voltage close to 0V |
| Connect the test box | Connect. | Signal type | Ignition on | Idle |
|---|---|---|---|---|
| 43 | 1 | Power supply Ext X | U=Ubat | |
| 44 | 2 | Communication wire control units (CANH) | U=2.5-3.5V | |
| 45 | 3 | Communication wire control units (CANL) | U=1.5-2.5V | |
| 46 | 4 | Background lamp signal | Lamp off:U=Ubat Lamp on:U=Ulow |
|
| 47 | 5 | Brake fluid level signal (+) | Lamp off:U=Ubat Lamp on:U=Ulow |
|
| 48 | 6 | Parking brake signal (+) | Lamp off:U=Ubat Lamp on:U=Ulow |
|
| 49 | 7 | |||
| 50 | 8 | Communication wire control units (CANH) | U=2.5-3.5V | |
| 51 | 9 | Communication wire control units (CANL) | U=1.5-2.5V | |
| 52 | 10 | |||
| 53 | 11 | |||
| 54 | 12 | |||
| 55 | 13 | |||
| 56 | 14 | Signal ground | U=Ulow | |
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.