Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Lexus >> 2007 >> RX 400h AWD >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Cruise Control >> Dynamic Laser Cruise Control System >> DTC P0571 Stop Light Switch Circuit Malfunction >> Inspection Procedure

Inspection Procedure

  1. CHECK BRK RELAY 
    1. Remove the BRK relay from the engine room R/B No. 1.
    2. Check operation of the BRK relay.

    Standard resistance 

    TERMINALS NO. AND SPECIFIED CONDITION

    Terminal No. Condition Specified value
    3 - 5 Always 10 kΩ or higher
    3 - 5 When battery voltage is applied to terminal 1 and 2. Below 1 Ω

    NG: REPLACE BRK RELAY 

    Fig 1: Checking BRK Relay
    G05005598Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  2. CHECK WIRE HARNESS AND CONNECTOR (BRK RELAY - BATTERY) 
    1. Disconnect the connector from the engine room R/B.
    2. Measure the voltage according to the value(s) in the table below.

    Standard voltage 

    TERMINALS NO. AND SPECIFIED CONDITION

    Terminal No. Condition Specification
    5 - Body ground Always 10 to 14 V
    2 - Body ground Ignition switch on 10 to 14 V
    2 - Body ground Ignition switch off Below 1 V

    NG: CHECK FOR SHORT IN ALL HARNESS AND COMPONENTS CONNECTED FAILURE RELAY (BRK RELAY) 

    Fig 2: Identifying Terminals Of BRK Relay
    G05279921Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  3. CHECK WIRE HARNESS AND CONNECTOR (BRK RELAY - SKID CONTROL ECU) 
    1. Disconnect the connectors from the skid control ECU.
    2. Measure the resistance according to the value(s) in the table below.

    Standard resistance 

    TERMINALS NO. AND SPECIFIED CONDITION

    Terminal No. Condition Specification
    4 - S39-14 (STP) Always Below 1 Ω
    4 - Body ground Always 10 kΩ or higher
    3 - S40-24 (EXI) Always Below 1 Ω
    3 - Body ground Always 10 kΩ or higher
    1 - S41-11 (CR) Always Below 1 Ω
    1 - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 3: Identifying Terminals Of Skid Control ECU Connectors
    G05279922Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE SKID CONTROL ECU 

scientia non olet · About Mike's Workshop Manuals