Toyota Corolla / Lexus 6-Pin 0.6mm Light Switch Harness Connector – OEM 7189-7501-90 / 90980-12C78
Direct OEM-specification replacement for the Sumitomo 6-pin wire harness connector used on light switch (combination switch / stalk switch) circuits across Toyota Corolla and Lexus platforms. Cross-references Sumitomo / Toyota OEM part numbers 7189-7501-90, 90980-12C78, and 12C78. Uses the 0.6mm contact series in black nylon housing — the 0.6mm series is Toyota’s ultra-fine pitch connector for high-density signal harnesses in the steering column and instrument cluster area.
The 6-pin 0.6mm light switch connector is located on the steering column, connecting the light switch stalk to the body control module (BCM) or instrument cluster harness. The 0.6mm terminal is the finest contact series in the Sumitomo automotive connector range and is particularly susceptible to corrosion and mechanical damage. A failed connector causes intermittent or permanent lighting switch faults — the headlights, position lights, or instrument illumination may become unresponsive to the switch. The ultra-fine 0.6mm terminal is easily damaged during steering column removal if the connector is pulled without pressing the release tab.
| OEM Number | Application |
|---|---|
| 7189-7501-90 | Sumitomo 6-pin 0.6mm light switch connector (primary) |
| 90980-12C78 | Toyota OEM cross-reference |
| 12C78 | Abbreviated Toyota part number |
| Attribute | Detail |
|---|---|
| Pin Count | 6-Pin |
| Contact Series | 0.6mm pitch (Sumitomo ultra-fine series) |
| Housing Material | Nylon, black |
| Sealing | Non-waterproof (interior / steering column application) |
| OEM Part Numbers | 7189-7501-90 / 90980-12C78 |
| Applications | Light switch (stalk switch), combination switch, instrument cluster harness |
| Compatible Models | Toyota Corolla (E120 / E140 / E150 / E170); Lexus IS / GS / ES |
| Terminal Included | Yes |
Q: My Toyota Corolla headlight switch is intermittent — could it be the connector?
A: Yes. A corroded or damaged 6-pin 0.6mm light switch connector is a common cause of intermittent headlight switch faults on Toyota Corolla. The ultra-fine 0.6mm terminal is easily damaged during steering column removal. Inspect the connector before replacing the stalk switch assembly.
Q: Are terminals included?
A: Yes, terminals are included with all variants.
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6 Pin Connectors
