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.
Communications Network - Description & Operation: Notes
| Item Number | Description |
|---|---|
| 1 | Auxiliary junction box |
| 2 | Engine control module (ECM) junction box - right-hand drive vehicles |
| 3 | Engine control module (ECM) junction box - left-hand drive vehicles |
| 4 | Central junction box (CJB) right-hand |
| 5 | Battery junction box (BJB) |
| 6 | High power protection module |
| 7 | Central junction box (CJB) left-hand |
There are six fusebox assemblies per vehicle, five of which have conventional, replaceable fuses. The High Power Protection Module does not have conventional fuses.
Two Engine Control Module (ECM) Junction Box is shown. Only one is fitted (LHD or RHD) to any vehicle, on the opposite side to the pedal box.
The High Power Protection Module comprises of two fusible links to protect the starting circuit and the battery positive supply to the other fuse-boxes.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.