P1682 Lexus Ignition 1 Switch Circuit 2
Possible causes
– Faulty ignition switch
– Ignition Switch harness is open or shorted
– Ignition Switch circuit poor electrical connection
– Faulty Engine Control Module (ECM)
– Ignition Switch harness is open or shorted
– Ignition Switch circuit poor electrical connection
– Faulty Engine Control Module (ECM)
What about the obd code?
The ECM has detected a voltage deifference between two circuits
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– Possible no crank or start
– Possible no crank or start
P1682 Lexus Description
There are 2 ignition 1 voltage circuits supplied to the Engine Control Module (ECM). The first ignition circuit is provided by the powertrain relay, through a fuse. This ignition 1 voltage circuit supplies power to all the internal ECM circuits associated with the throttle actuator control (TAC) operation. The second ignition 1 voltage circuit is supplied by the run/crank relay through a fuse, and is used to power the remaining internal ECM circuits. If the ECM detects a voltage difference between the 2 ignition 1 voltage circuits, DTC P1682 Lexus will set.
Lexus Vehicle:Lexus ES,Lexus GS,Lexus GX,Lexus HS,Lexus IS,Lexus LFA,Lexus LS,Lexus LX,Lexus RX,Lexus RX,Lexus SC,Lexus GS350,Lexus GS450H,Lexus IS250,Lexus GX460,Lexus IS350,Lexus LS460,Lexus LS600H,Lexus LX570,Lexus RX350