6-Pin Ignition Lock Cylinder & Relay Switch Connector – CY7061-6.3-21 | 6.3mm High-Current
OEM-specification 6-pin connector for ignition lock cylinder switch and relay harness applications. Cross-references part number CY7061-6.3-21. The 6.3mm terminal pitch is the automotive industry standard for high-current ignition switch circuits, providing the contact area and current capacity required for starter relay, KL15 ignition power, and KL30 permanent power circuits. Used across multiple vehicle platforms for ignition switch and relay harness connections. Available bare or with 15cm pre-wired leads.
The ignition switch connector is one of the highest-stress connectors in the vehicle. It carries the full ignition power load (KL15), the starter relay signal (KL50), and the permanent battery feed (KL30) — all simultaneously during engine cranking. The combination of high current, heat cycling, and vibration accelerates terminal oxidation. A corroded ignition switch connector causes a cascade of symptoms that are frequently misdiagnosed as a failed ignition switch, BCM, or immobiliser module:
| Pin | Circuit Label | Function | Current Load | Failure Symptom if Corroded |
|---|---|---|---|---|
| 1 | KL30 | +12V permanent battery power (always live) | High (up to 30A) | Ignition switch completely dead, no response in any position |
| 2 | KL15 | +12V ignition power output (live in IGN position) | High (up to 20A) | ECU, fuel pump, sensors not powering up — no-start, no fault codes |
| 3 | KL50 | Starter relay trigger signal (live in START position only) | Low (signal) | No crank — engine won’t start, starter motor not engaging |
| 4 | KL75 | Accessory power output (live in ACC and IGN positions) | Medium (up to 10A) | Radio, windows, accessories not working in ACC position |
| 5 | BCM/Immobiliser | Ignition switch position signal to BCM / immobiliser module | Low (signal) | Key not recognised, immobiliser active, security light flashing |
| 6 | KL31 | Ground / chassis earth return | High (shared return) | Ignition switch erratic, multiple intermittent faults across all positions |
| Attribute | Detail |
|---|---|
| Pin Count | 6-Pin |
| Part Number | CY7061-6.3-21 |
| Terminal Pitch | 6.3mm (automotive high-current standard) |
| Current Rating | Up to 30A per circuit (KL30/KL15) |
| Housing Material | High-temp nylon (PA66), heat-resistant |
| Terminal Material | Copper alloy, tin-plated |
| Wire Option | Bare connector / 15cm pre-wired leads |
| Application | Ignition lock cylinder switch harness, relay harness |
| Sealing | Non-sealed (interior / dry environment) |
The 6.3mm terminal pitch is specifically designed for high-current automotive circuits. Compared to the 2.8mm pitch used for sensor signals, the 6.3mm terminal has approximately 5× the contact surface area, which is essential for the KL30 and KL15 circuits that carry the full ignition power load. Using a 2.8mm connector on a KL30 circuit would cause the terminal to overheat and fail within hours. Always verify the terminal pitch before ordering a replacement ignition switch connector.
| Symptom | Likely Corroded Pin | Test Method |
|---|---|---|
| No crank, no click from starter | Pin 3 (KL50) | Measure voltage at Pin 3 in START position — should be +12V |
| No crank, relay clicks but starter doesn’t engage | Pin 1 (KL30) or Pin 6 (KL31) | Measure voltage drop across Pin 1 and Pin 6 under load |
| ECU not powering up, no fault codes | Pin 2 (KL15) | Measure voltage at Pin 2 in IGN position — should be +12V |
| Radio / windows not working in ACC | Pin 4 (KL75) | Measure voltage at Pin 4 in ACC position — should be +12V |
| Immobiliser active with correct key | Pin 5 (BCM signal) | Check BCM communication with scan tool — look for U-codes |
| Multiple intermittent faults across all positions | Pin 6 (KL31 ground) | Measure resistance from Pin 6 to chassis ground — should be <0.1Ω |
Q: My car cranks but won’t start and has no fault codes — could it be the ignition switch connector?
A: Yes. A corroded KL15 pin (Pin 2) in the ignition switch connector causes the ECU, fuel pump, and sensors to lose power simultaneously. The ECU cannot log fault codes because it has no power. This is one of the most commonly misdiagnosed no-start conditions — the engine cranks because the starter circuit (KL50, Pin 3) is on a separate pin and may still be functional. Inspect the 6-pin ignition connector before replacing the ECU or fuel pump.
Q: What is the difference between KL15 and KL30?
A: KL30 (Pin 1) is the permanent battery feed — it is always live regardless of ignition position. KL15 (Pin 2) is the ignition-switched feed — it is only live when the ignition is in the ACC or IGN position. KL50 (Pin 3) is only live in the START position to trigger the starter relay.
Q: Can I use this connector for a relay harness?
A: Yes. The 6.3mm pitch and high-current rating make this connector suitable for relay harness applications requiring up to 30A per circuit.
Q: Are terminals included?
A: Yes, terminals are included with all variants.
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