Starters: Other Lexus RX I

SC300 & SC400

With ignition switch in START position, current flows to Park/Neutral Position (PNP) switch. PNP switch prevents the starter from operating if the transmission is in gear. Current flows through the starter relay coil and is grounded at theft deterrent and door lock control ECU. This energizes the starter relay, allowing battery power to the starter solenoid. The starter solenoid engages, allowing current to flow through starter motor field coils.

Except SC300 & SC400

With ignition switch in START position, current flows to Park/Neutral Position (PNP) switch. PNP switch prevents the starter from operating if the transmission is in gear. Current flows through the starter relay coil to ground. This energizes the starter relay, allowing battery power to the starter solenoid. The starter solenoid engages, allowing current to flow through starter motor field coils.

ES300

Remove glove box and locate ECM. See COMPONENT LOCATIONS. Using DVOM, backprobe ECM 22-pin connector E7 terminal No. 7 (Gray wire). (Scheme 16) Check for voltage with ignition in START position. If voltage is 6 volts or more, ECM is okay. If voltage is less than 6 volts, check for open in wiring harness or connectors between ECM and starter relay. Repair as necessary. If wiring harness and connectors are okay, replace ECM.

Scheme 16

GS300

Remove ECM hood and cover, and locate ECM. See COMPONENT LOCATIONS. Using DVOM, backprobe ECM 28-pin connector E5 terminal No. 2 (Black wire). (Scheme 17) Check for voltage with ignition in START position. If voltage is 6 volts or more, ECM is okay. If voltage is less than 6 volts, check for open in wiring harness or connectors between ECM and starter relay. Repair as necessary. If wiring harness and connectors are okay, replace ECM.

Scheme 17

GS400

Remove ECM hood and cover, and locate ECM. See COMPONENT LOCATIONS. Using DVOM, backprobe ECM 28-pin connector E5 terminal No. 17 (Black wire). (Scheme 17) Check for voltage with ignition in START position. If voltage is 6 volts or more, ECM is okay. If voltage is less than 6 volts, check for open in wiring harness or connectors between ECM and starter relay. Repair as necessary. If wiring harness and connectors are okay, replace ECM.

LS400

Remove instrument panel under cover, and locate ECM. See COMPONENT LOCATIONS. Using DVOM, backprobe ECM 28-pin connector E11 terminal No. 17 (Black wire). (Scheme 17) Check for voltage with ignition in START position. If voltage is 6 volts or more, ECM is okay. If voltage is less than 6 volts, check for open in wiring harness or connectors between ECM and starter relay. Repair as necessary. If wiring harness and connectors are okay, replace ECM.

RX300

Remove glove box and locate ECM. See COMPONENT LOCATIONS. Using DVOM, backprobe ECM 22-pin connector E11 terminal No. 7 (Gray wire). (Scheme 16) Check for voltage with ignition in START position. If voltage is 6 volts or more, ECM is okay. If voltage is less than 6 volts, check for open in wiring harness or connectors between ECM and starter relay. Repair as necessary. If wiring harness and connectors are okay, replace ECM.

SC300

Remove instrument panel under cover, and locate ECM. See COMPONENT LOCATIONS. Using DVOM, backprobe ECM 28-pin connector E18 terminal No. 2 (Green/Red wire). (Scheme 17) Check for voltage with ignition in START position. If voltage is 6 volts or more, ECM is okay. If voltage is less than 6 volts, check for open in wiring harness or connectors between ECM and starter relay. Repair as necessary. If wiring harness and connectors are okay, replace ECM.

SC400

Remove instrument panel under cover, and locate ECM. See COMPONENT LOCATIONS. Using DVOM, backprobe ECM 28-pin connector E18 terminal No. 17 (Green/Red wire). (Scheme 17) Check for voltage with ignition in START position. If voltage is 6 volts or more, ECM is okay. If voltage is less than 6 volts, check for open in wiring harness or connectors between ECM and starter relay. Repair as necessary. If wiring harness and connectors are okay, replace ECM.

BRUSHES

1. Using a vernier caliper, measure brush length. See «STARTER SPECIFICATIONS»(ref-4365-S40049889422000062100000) . If brush length is less than minimum specification, replace brush holder and field frame.
2. Using a pull scale, note brush spring tension the instant the brush spring separates from brush. See «STARTER SPECIFICATIONS»(ref-4365-S40049889422000062100000) . If brush spring tension is less than minimum specification, replace brush springs.

ES300, GS300, RX300 & SC300

TORQUE SPECIFICATIONS (ES300, GS300, RX300 & SC300)

GS400, LS400 & SC400

TORQUE SPECIFICATIONS (GS400, LS400 & SC400)