Indicator
Connect the positive (+) lead from the battery to terminal 4 and the negative (-) lead to terminal 1. (Scheme 43) Push the switch, check that the indicator light lights up. If the operation is not as specified, replace the switch. See SEAT HEATER SWITCH under REMOVAL & INSTALLATION.
Scheme 43
Disconnect the switch connector and inspect the connector on the wire harness side (Scheme 44) If circuit is not a specified, replace the wire harness.