RX400h · Service Manual BODY ELECTRICAL

Back-up Light Circuit

Circuit diagnosis

DESCRIPTION

The HV control ECU receives shift position R signal and controls the back-up light relay. The back-up light relay installed in the power distributor.
System diagram of the power distributor (Click here).
System description of the power distributor (Click here).

WIRING DIAGRAM

B110617E02

INSPECTION PROCEDURE


1. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

  1. B110618E01
    Disconnect the connector from the J/B No.2 (power distributor).

  1. Measure the voltage according to the value(s) in the table below.

    Voltage:
    Tester connection
    		 Condition
    		 Specified value
    BUB (2F-3) - Body ground
    		 Ignition switch ON
    		 10 to 14 V
    BUB (2F-3) - Body ground
    		 Ignition switch OFF
    		 Below 1 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2. CHECK MODE MONITOR TERMINAL (BACK-UP RELAY)

  1. I037287E01
    Preparation

    1. Connect the connector.

    2. Remove the cover of the fusible link block assembly.

    3. Set the vehicle to the following condition.

      1. Ignition switch ON.
      2. Shift in R position.

  1. Check voltage

    1. Measure the voltage between the Mode Monitor Terminal and body ground.

      Voltage:
      Result
      		 Proceed to
      0 V or Approx. 12 V
      		 A
      Approx. 6.2 V
      		 B
      Approx. 2.0 V
      		 C



B
Go to step 5

C
Go to step 9
A


3. CHECK HARNESS AND CONNECTOR (J/B NO. 2 - MODE MONITOR TERMINAL)

  1. E111537E01
    Disconnect the 2G connector from the J/B No.2.

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester connection
    		 Condition
    		 Specified value
    2G-5 - Mode monitor terminal
    		 Always
    		 Below 1 Ω
    2G-5 - Body ground
    		 Always
    		 10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4. CHECK HARNESS AND CONNECTOR (J/B NO.2 - BODY GROUND)

  1. B113765E01
    Disconnect the connector from the J/B No.2.

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester connection
    		 Condition
    		 Specified value
    2H-13 (SGND) - Body ground
    		 Always
    		 Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5. INSPECT JUNCTION BLOCK NO.2 (BACK-UP RELAY)

  1. Turn the ignition switch to OFF position.

  1. Remove the J/B No.2.

  1. Inspect the back-up relay.I037289E03

    1. Connect the positive battery lead to terminal BUB of the J/B No.2 and the negative lead to terminal SGND, PGND.

      Symbols (terminals No.)
      		 Connection
      BUB (2F-3) - SGND (2H-13), PGND (2F-1)
      		 Positive - Negative

    2. Measure the voltage according to the value(s) in the table below.

      Voltage:
      Tester Connection
      		 Specified Condition
      BUL (2E-1) - SGND (2H-13)
      		 0 V

    3. Connect the battery positive lead to terminal BKR of the J/B No.2.

      Symbols (terminals No.)
      		 Connection
      BKR (2G-7)
      		 Positive

    4. Measure the voltage according to the value(s) in the table below.

      Voltage:
      Tester Connection
      		 Specified Condition
      BUL (2E-1) - SGND (2H-13)
      		 10 to 14 V



NG
REPLACE JUNCTION BLOCK NO.2
OK


6. CHECK HARNESS AND CONNECTOR (J/B NO. 2 - HV CONTROL ECU)

  1. E111715E03
    Disconnect the connector from the J/B No.2 (power distributor) and HV control ECU.

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester connection
    		 Condition
    		 Specified value
    2G-7 (BKR) - H30-29 (BL)
    		 Always
    		 Below 1 Ω
    2G-7 (BKR) - Body ground
    		 Always
    		 10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7. CHECK HARNESS AND CONNECTOR (J/B NO. 2 - BULB)

  1. E111716E01
    Disconnect the connectors from the J/B No.2 (power distributor) and back-up light bulbs.

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester connection
    		 Condition
    		 Specified value
    2E-1 (BUL) - B14-2 (Back-up light LH)
    		 Always
    		 Below 1 Ω
    2E-1 (BUL) - B15-2 (Back-up light RH)
    		 Always
    		 Below 1 Ω
    2E-1 (BUL)- Body ground
    		 Always
    		 10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8. CHECK HARNESS AND CONNECTOR (BULB - BODY GROUND)

  1. B110619E01
    Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester connection
    		 Condition
    		 Specified value
    B14-1 (Back-up light LH) - Body ground
    		 Always
    		 Below 1 Ω
    B15-1 (Back-up light RH) - Body ground
    		 Always
    		 Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

9. CHECK HARNESS AND CONNECTOR (SHORT CIRCUIT DRIVEN SIDE BY RELAY)

  1. B110620E01
    Preparation

    1. For easier disconnection, remove the J/B No.2 and then take apart the connectors.

    2. Disconnect only the connector "2E" .

  1. Check voltage

    1. Measure the voltage between the Mode Monitor Terminal and body ground.

      Voltage:
      Result
      		 Proceed to
      Approx. 6.2 V
      		 A
      Approx. 2.0 V
      		 B



B
REPLACE JUNCTION BLOCK NO.2
A

REPAIR OR REPLACE HARNESS OR CONNECTOR (SHORT CIRCUIT BETWEEN BACK-UP LIGHT AND J/B NO. 2)


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