L4 Switch Circuit Malfunction
Table of contents
C1789 TOYOTA Possible Causes
- Faulty L4 Switch Circuit
- L4 Switch Circuit harness is open or shorted
- L4 Switch Circuit circuit poor electrical connection
- Faulty Suspension Control ECU
How do I fix code C1789 TOYOTA?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the C1789 TOYOTA code
The cost of diagnosing the C1789 TOYOTA code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Anti-Lock Brake System (ABS) Warning Light ON
- Engine Light ON (or Service Engine Soon Warning Light)
C1789 TOYOTA Description
This circuit is sending the signal to the Suspension Control ECU by detecting that the transfer shift lever is in L4 position.