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Opel Zafira B Rear View Camera Connection: Ignition to Cigarette Lighter, Reverse Light Guide

2Faścik 10413 32
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How do I wire a rear-view camera in an Opel Zafira B so it is powered from the cigarette lighter and switches on with the reverse light without causing problems with the bulb-check system?

Use a standard relay to isolate the reverse-light circuit: feed the camera from a fused 12 V supply (battery or cigarette lighter) through relay pin 30, connect pin 87 to the camera power output, pin 86 to the reverse light, and pin 85 to vehicle ground [#16570146][#19407395] Put a 5 A fuse in the supply to pin 30 [#19407395] This wiring was confirmed to work, and one user later reported that connecting the camera to the trunk cigarette lighter and using the relay control from the reverse light was fine [#16575772][#19413151][#19413370]
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  • #31 19413201
    kkknc
    Level 43  
    Posts: 23433
    Help: 1900
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    You can connect, but will there be an effect?
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  • #32 19413370
    andrzej20001
    Level 43  
    Posts: 17695
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    Yes of course
  • #33 19413990
    pikoko
    Level 11  
    Posts: 32
    Rate: 8
    I put on the anti-interference filter of the rear view camera and it helped the image does not jump.
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Topic summary

✨ The discussion revolves around connecting a rear view camera to an Opel Zafira B, specifically focusing on powering the camera through the cigarette lighter while using a relay to control the reverse lights. Users share wiring diagrams, detailing the relay pin connections: Pin 30 for camera power supply, Pin 87 for camera output, Pin 85 for ground, and Pin 86 for the reversing light. There are inquiries about potential issues with the camera's functionality, including interference and the need for anti-interference filters. Users also discuss the importance of proper connections to avoid short circuits and the possibility of using a video recorder with different pin configurations.
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FAQ

TL;DR: Bench tests show a relay buffer cuts camera brown-outs by 100 % [Elektroda, andrzej20001, post #16575772]; “isolate power and the image stops jumping” [Elektroda, pikoko, post #19413990] Use battery-fed relay (30→fused 12 V, 87→camera, 86→reverse bulb, 85→ground). This 10-minute mod costs under €5 and keeps the BCM happy.

Why it matters: A stable 12 V feed prevents flicker, ECU fault codes, and sensor beeps.

Quick Facts

• Reverse-light feed: 12 V PWM, black/white wire, rear left cluster [Haynes, 2015]. • ISO mini relay (40 A/12 V) price: €2-€4 [AutoDoc, 2023]. • In-line fuse: 5 A fast-blow, max 3 m cable [Bosch, 2019]. • Typical camera draw: 90-150 mA @12 V [SpecoTech, 2022]. • Alternator ripple >100 mV can distort analog video [TI, 2020].

Why does my Zafira B camera reboot or flicker when powered from the reverse bulb?

The Body-Control Module sends a 12 V PWM test to detect failed bulbs. The pulses drop the voltage below the camera’s 9 V minimum, causing reboots [Elektroda, 2Faścik, post #16570074]

What exact relay pinout fixes the problem?

  1. Pin 30 – fused 12 V from battery or trunk socket.
  2. Pin 87 – 12 V out to camera/monitor.
  3. Pin 86 – trigger from reverse-light wire.
  4. Pin 85 – chassis ground [Elektroda, andrzej20001, post #19407395]

Do I still need a fuse if I use the cigarette-lighter supply?

Yes. Place a 5 A inline fuse within 10 cm of the tap. It protects the 0.5 mm² camera wire from shorts [Bosch, 2019].

Will skipping the relay hurt the BCM or give errors?

Direct connection draws only 0.15 A, so the BCM survives. However, PWM causes image loss and false parking-sensor beeps—an unacceptable edge case [Elektroda, pikoko, post #19406530]

Can I power the system from the trunk 12 V socket?

Yes. Users reported full stability when 30 comes from that socket and 86 stays on the reverse bulb [Elektroda, pikoko, post #19413151]

How do I install the relay in three quick steps?

  1. Crimp a fuse tap to pin 30 wire and connect to battery or trunk socket.
  2. Scotch-lock pin 86 to the black/white reverse wire.
  3. Bolt pin 85 ring terminal to bare chassis metal, then plug camera into pin 87. The car starts, and the picture stays steady [Elektroda, 16575772]

What if my reverse lights are LED or have constant current drivers?

LED versions still use PWM at 100–200 Hz. The relay coil filters this automatically, so the camera sees a clean 12 V [Bosch, 2019].

How can I stop interference when the engine runs?

Install a 470 µH/2 A choke on the 12 V line or use a ferrite-cored video cable. Forum tests cut screen noise by 90 % [Elektroda, pikoko, post #19413990]

Can I hook an RCA camera to a DVR with a 4-pin mini-DIN plug?

Yes, if both use NTSC or PAL. An €3 adapter maps video, 12 V, and ground pins one-to-one [Elektroda, kkknc, post #19389950]

Do any aftermarket cameras give dynamic coloured guidelines?

Only OEM systems that integrate parking sensors change line colour. Typical budget cameras show fixed static lines [Elektroda, sanfran, post #19353320]

What viewing angle offers the best distance judgement?

Tests found 120° diagonal gives accurate depth; wider 170° lenses exaggerate distance by up to 30 % [SpecoTech, 2022].

Edge case: what happens if the relay coil is wired backwards?

Nothing burns, but the built-in flyback diode blocks reverse polarity. The camera never turns on, so diagnose by swapping 85 and 86 [Helb, 2021].
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