Edc17c10 peugeot 308 1.6hdi 2014

Ton1 said:

Bsm engine fuse box 9807091580. BSM-Z01-03.
Does anyone have a wiring diagram for this...

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That part number (9807091580, BSM-Z01-03) confirms this is a 308 T9 (the newer model starting late 2013/2014 on the EMP2 platform).

It is very important to understand that with PSA vehicles, there is no single "pinout diagram" for a specific BSM part number. The internal switching and fuse assignments are the same, but the external wiring on the connectors changes completely depending on the vehicle's specific options (e.g., Xenon vs Halogen lights, fog lights, heated windscreen, specific engine type, etc.).

To get the correct wiring diagram, you must use the vehicle's VIN.

If you post the last 8 digits of your VIN (VIS), someone here with access to PSA SEDRE (Service Box documentation) might be able to pull the specific schematics for your car.

Also, specify what system you are troubleshooting. You won't find one diagram for the whole BSM; you will find separate diagrams for "Front Lighting," "Engine Power Supply," "Wipers," etc., all of which connect to the BSM.

VIN:VF3LB9HPAES159012
Looking for engine power supply to fuel regulator solinoid, turbo control valve and oxygen sensor. Fuses f6 f7 f8 have no power.

Ton1 said:

VIN:VF3LB9HPAES159012
Looking for engine power supply to fuel regulator solinoid, turbo control valv...

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Thanks for the VIN. That confirms it's a 308 T9 with the 1.6 HDi (DV6FD engine).

On this BSM-Z01 architecture (EMP2 platform), you won't find an external "Main Relay" for the engine. It is integrated directly inside that BSM unit you are looking at.

Fuses F6, F7, and F8 share a common internal power rail inside the BSM. This rail is fed by that integrated Main Engine Relay.

Here is how it works and why those fuses are likely dead:

1. Permanent Power: The BSM receives permanent battery power via the large ring terminal stud and sometimes a high-amperage connector.
2. Ignition On: When you turn the key, the BSI wakes up and tells the Engine ECU to wake up via CAN bus.
3. ECU Command: The Engine ECU checks its safety parameters (immobilizer status, etc.). If everything is okay, the ECU sends a ground (earth) signal via a small wire back to a specific pin on one of the BSM connectors.
4. Relay Activation: This ground signal energizes the coil of the relay integrated inside the BSM.
5. Power Distribution: The internal relay closes and sends power to the internal rail feeding fuses F6, F7, F8 (and usually others like F4 or F10 depending on the exact variant).

Troubleshooting Steps:

Since all three are dead, the issue is not the fuses themselves, but the supply to them.

1. Check Main BSM Feeds
Before anything else, check the large Maxi-fuses that sit underneath the BSM tray or right next to the battery positive terminal. Make sure the BSM itself has its main heavy-gauge 12V supply.

2. Check the ECU Command Signal
This is the critical test. You need to find out if the ECU is trying to turn the BSM on.

• Locate connector 28V NR (28-pin Black) or sometimes 28V GR (28-pin Grey) on the BSM.
• You are looking for the wire coming from the Engine ECU that controls the main relay. On many T9s, this is often around pin 21 or 22 of the 28-way connector, but it varies.
• Test method: Use a multimeter back-probed into the connector. With ignition ON, you should see near 0V (ground) on the control pin if the ECU is commanding the relay on. If you see 12V (or floating voltage), the ECU is not commanding the relay on.

Summary:
If the ECU is sending the ground signal, but F6/F7/F8 have no power -> The BSM internal relay is faulty (replace BSM).
If the ECU is not sending the ground signal -> The problem is elsewhere (ECU not waking up, immobilizer issue, or faulty ECU).

Will test and report. Thankyou

Ton1 said:

Will test and report. Thankyou

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Sounds good.

That test for the ground command signal from the ECU is the critical one. It cuts the problem right down the middle: either the ECU isn't asking for power, or the BSM isn't delivering it.

Let us know how you get on.

Ground signal from the ecu was 0v, this proved the ecu is demanding power.
I changed the bsm unit and all is good.
Faulty bsm internal relay.

Ton1 said:

Ground signal from the ecu was 0v, this proved the ecu is demanding power.
I changed the bsm unit an...

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That is excellent news. Great job on the diagnosis.

Your test was definitive: seeing that 0V ground command confirmed the ECU was doing its job perfectly. It proved beyond doubt that the internal relay inside the BSM had failed to close and supply the power rail for those fuses.

Thanks for reporting back with the final fix; this thread will be very helpful to others with similar symptoms on the T9 platform.