Description
Rear Window Heater Switch For Citroën C1, Peugeot 107 And Toyota Aygo, First Generation
This original-style rear window heater switch is designed for the first-generation Citroën C1 and Peugeot 107, and is also compatible with the equivalent Toyota Aygo models. Built to the OEM form, fit and function, it operates the rear window defogger circuit and provides the driver with the tactile switch and indicator lamp expected in workshop repairs or DIY replacements. Customers often search by part numbers 84790-0H010 and 654612 when looking for this component.
Key Benefits
- Direct fit for dashboard opening—no trimming or modification required.
- OEM-style operation and indicator illumination for correct cabin feedback.
- Useful spare for workshops and independent mechanics performing quick electrical repairs.
Fitment And Compatibility
Compatible With: Citroën C1 (first generation), Peugeot 107 (first generation), Toyota Aygo (first generation). Always verify the part number matches the item being replaced (common search references: 84790-0H010, 654612).
How It Works
The switch sends a activation signal to the rear window defogger relay and illuminates the switch indicator when engaged. In these vehicle platforms the heavy current for the heated rear window is normally handled by a relay; the switch provides the control input and status lamp.
Replacement Procedure (Summary)
- Preparation: Park the vehicle on a level surface, set the ignition off and remove the key.
- Safety: Disconnect the negative battery terminal before starting to avoid short circuits while working on the dash wiring.
- Access: Carefully remove surrounding trim panels using plastic trim tools to avoid damage to the dash finish.
- Disconnect: Unplug the electrical connector from the back of the switch and release any retaining clips.
- Swap: Remove the old switch and insert the replacement until it locks in place. Reconnect the electrical connector.
- Test: Reconnect the battery, switch on the ignition and operate the heater switch to confirm relay activation and indicator illumination.
Installation Recommendations
Use trim removal tools to avoid damaging the dashboard trim. Inspect the switch connector and wiring for corrosion or heat damage before installing the new switch. If connector pins are corroded or wiring insulation is brittle, repair or replace the connector harness to ensure a reliable connection. Typical replacement time for an experienced technician is 15–30 minutes.
Most Common Causes Of Failure
- Wear Of Internal Contacts: Frequent use and arcing can degrade switch contacts, causing intermittent operation or failure to engage the defogger.
- Backlight Or Indicator Failure: The lamp or LED inside the switch may burn out, so the defogger works but the switch fails to illuminate.
- Moisture And Corrosion: Water ingress or condensation in the dash can corrode connector pins and switch internals leading to poor electrical contact.
- Mechanical Damage: Broken actuator or housing from forced operation or impact when removing trim panels.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C1, Peugeot 107, Toyota Aygo (First Generation)
- Product Codes: 84790-0H010, 654612
- Other Numbers: OE Reference Numbers May Be Listed Under The Above Codes
Final Notes
This switch is intended for professional fitment or experienced DIYers familiar with vehicle electrical systems. If the defogger still does not operate after replacing the switch, check the defogger relay, fuse, rear window heating element continuity and ground connections as part of a systematic diagnosis.
