Description
Complete BEHR digital air conditioning wiring harness for Peugeot 307 from 2004
Part description
The used BEHR digital air conditioning wiring harness for Peugeot 307 from 2004 is used to electrically connect the components of the air conditioning system. It is a suitable solution when repairing damaged wiring, for example, broken wires or damaged connectors. Replacing the entire harness may be more practical than repairing several damaged sections of the original wiring.
When choosing a replacement, refer especially to the numbers 42991 and 643642, the connector design, and the arrangement of the individual branches. It is also important to distinguish between air conditioning system versions—this harness is listed in the source information for BEHR digital air conditioning.
Technical information
- Manufacturer: BEHR
- Model: Peugeot 307
- Other numbers: T5 – additional designation in the product name
- Part type: digital air conditioning wiring harness
- Application according to the source information: Peugeot 307 from 2004, BEHR digital air conditioning
- Condition: used automotive part
- Scope according to the original description: complete harness
- Additional designation in the source information: NFP
Product codes
- Product codes: 42991, 643642
- Model: Peugeot 307
Compare the numbers with the markings on the original part. Check compatibility by considering the air conditioning system type, connector shape, connector pin configuration, and harness routing—not just the vehicle model.
Installation recommendations
The following procedure is a general guide to replacing an air conditioning wiring harness. The exact access to the part, extent of disassembly, and procedure for disconnecting the electrical system depend on the specific vehicle version. Follow the manufacturer’s service documentation.
1) Before installation
- First, verify that the fault is actually caused by the wiring, rather than the power supply, controls, or one of the connected components.
- Compare the part numbers, number and shape of the connectors, their keying, pin configuration, branch lengths, and mounting points with the old harness.
- Inspect the insulation, protective sheathing, connector locks, and contacts. Look for cracks, abrasions, corrosion, signs of overheating, and improper repairs.
- If checking wire continuity, do so on the disconnected harness according to the wiring diagram. Do not apply test voltage to unknown contacts.
2) Tools and materials required
- Standard hand tools suitable for the accessible fasteners and plastic trim tools for careful removal of interior trim.
- A multimeter, suitable test probes, and the wiring diagram for the specific vehicle.
- A flashlight, tools for labeling connectors, and a means of photographing the original wiring route.
- If needed, a suitable electrical contact cleaner and materials designed to protect and secure automotive wiring.
3) Step-by-step installation procedure
- Document the symptoms of the fault and the available air conditioning functions before replacement, if testing them is safe.
- Switch off the ignition and, following the manufacturer’s procedure, allow the electronics to enter their sleep state. Then disconnect the battery as specified.
- Access the harness by removing the necessary covers or trim, as instructed in the service documentation. Do not open the refrigerant circuit when replacing the wiring harness alone.
- Photograph the route of the original harness, its mounting points, and each connection. Label the connectors if necessary.
- Release the connector locks and disconnect the connectors by pulling on the connector body, never on the wires. Do not force stuck connections apart.
- Gradually release the fasteners and remove the original harness without damaging nearby components or adjacent wiring.
- Compare the two harnesses side by side. If there are differences in the wiring, connectors, or branching, stop the installation and confirm the correct version using the documentation.
- Route the replacement harness along the original path. Protect it from sharp edges, hot surfaces, and moving parts; the branches must not be stretched or pinched.
- Connect the matching connectors and check that their locks are engaged. Each connection should fit without excessive force.
- Check the entire route, fastenings, and clearance around nearby mechanisms. Restore the power supply according to the manufacturer’s instructions and perform a safe functional test; the wiring must be secured before final reassembly.
- After a successful check, reinstall the covers and trim. Make sure their edges and fasteners do not catch the wires.
4) Post-installation checks and functional verification
Test the digital air conditioning controls and their response to changes in the available settings, such as the requested temperature, fan speed, and airflow direction. Watch for interruptions, irregular behavior, or the smell of overheated insulation. If suitable diagnostic equipment is available, check for stored fault codes. Only take a short test drive once everything has been fully reassembled, and check that the functions do not cut out when the vehicle vibrates.
5) Common installation mistakes and how to avoid them
- Using the wrong harness version: compare the markings, connectors, and branching in advance—not just the vehicle model.
- Damaging contacts by forcing the connection: check the connector’s orientation and keying; do not use force.
- Pinched or stretched wires: follow the original route and inspect all at-risk areas before refitting the covers.
- Connector locks not fully engaged: after connecting, check that every connector is mechanically secured.
- Leaving the original cause of the fault unresolved: address any water ingress, unsuitable fastening, or fault in a connected component; otherwise, the replacement harness may also be damaged.
Reasons why the part gets damaged
Common causes of damage to air conditioning wiring harnesses in general include:
- Aging insulation and heat stress, which can cause wire protection to become brittle and crack.
- Vibration and abrasion due to loose mounting or incorrectly routed wiring.
- Moisture and water ingress, which promote contact corrosion and impair electrical connections.
- Overheating at connections due to poor contact or electrical overload.
- Careless previous disassembly, especially pulling on wires, breaking connector locks, and pinching the harness beneath covers.
- Improper wiring modifications, such as poor-quality connections or insufficiently protected repaired sections.
