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.
Signal Description
General
All the values given below are between the respective terminal in column 1 and terminal #C1-7 in column 2 (power ground) unless otherwise stated in parenthesis after the table entry.
It is important to connect the breakout box and check the ground connections before starting to measure.
There may be several connections and connectors between the control module and components. For more information about these, see relevant section in Wiring diagram.
| U = | DC voltage in volts (V) | UAC = | AC voltage in volts (V) |
| Ubat = | Battery voltage (V) | f = | Frequency in Hertz (Hz) |
| Ulow = | Voltage approximately 0 V | t = | Time in seconds |
| PWM = | Pulse width modulated signal as a % |
| Breakout box connection (951 1508) |
Control module terminal | Signal type | Ignition on | Idle | Miscellaneous |
|---|---|---|---|---|---|
| #A13 | #C1:1 | Communication CAN_L, Internal CAN | Communication with Supplemental Restraint System Module (SRS) | Communication with Supplemental Restraint System Module (SRS) | - |
| #A14 |
#C1:2 | Communication CAN_H, Internal CAN | Communication with Supplemental Restraint System Module (SRS) | Communication with Supplemental Restraint System Module (SRS) | - |
| #A15 |
#C1:3 | Communication CAN_L high speed network | During communication the voltage is 1.5 - 2.5 V | The voltage is 1.5-2.5 V during communication | - |
| #A16 |
#C1:4 | Communication CAN_H high speed network | During communication the voltage is 2.0 - 3.5 V | During communication the voltage is 2.0 - 3.5 V | - |
| #A17 |
#C1:5 | 15-feed | U = Ubat | U = Ubat | - |
| #C1:6 | - | - | - | - | |
| #A19 | #C1:7 | Ground | U=Ulow | U=Ulow | - |
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no 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.