Test TC-15C - Speed Control Solenoid Circuits Or Speed Control Power Relay Circuits

NOTE: Perform TEST TC-15A before proceeding.

NOTE: For connector terminal identification, refer to CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

Disconnect brakelight switch connector. Using scan tool in voltmeter mode, check voltage on brakelight switch connector, S/C (ON/OFF switch sense) power supply circuit (Yellow/Red wire). If voltage is 10 volts or less, perform TEST TC-15D . If voltage is more than 10 volts, go to next step.
Using an external ohmmeter, check resistance of switched S/C power supply circuit (Dark Blue/Red wire) between S/C servo 4-pin connector and brakelight switch connector. If resistance is less than 5 ohms, replace brakelight switch and perform TEST VER-4A . If resistance is 5 ohms or more, repair open switched S/C power supply circuit and perform TEST VER-4A.