LIGHTING SYSTEM Back-up Light Circuit

DESCRIPTION

The power management control ECU controls the back-up lights via the engine room junction block assembly.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC OUTPUT (HYBRID CONTROL SYSTEM)

   1. Check for DTCs Click here.

      OK
      Hybrid Control System DTCs are not output.

   NG

   GO TO HYBRID CONTROL SYSTEM Click here

   OK

2. CHECK ENGINE ROOM JUNCTION BLOCK ASSEMBLY

   1. Using a voltmeter, check the signal reading of the engine room junction block assembly Click here

      OK
      Output signal reading is normal.

   NG

   INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY (RESULTS OF SIGNAL READING CHECK) Click here

   OK

3. CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY POWER SOURCE AND BODY GROUND)

   1. Remove the engine room junction block assembly from the engine room relay block and junction block assembly Click here.

      

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

      Standard Voltage
      Tester Connection Condition Specified Condition A-1 (BATT) - Body ground Power switch off 11 to 14 V B-1 (ALT) - Body ground Power switch off 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition 1F-3 (GND1) - Body ground Always Below 1 Ω 1G-4 (GND2) - Body ground Always Below 1 Ω

      Text in Illustration

      *a

      Component without engine room junction block assembly (Engine Room Relay Block and Junction Block Assembly)

      -

      -

   NG

   REPAIR OR REPLACE HARNESS AND CONNECTOR

   OK

4. CHECK HARNESS AND CONNECTOR (REAR LIGHT ASSEMBLY - ENGINE ROOM JUNCTION BLOCK ASSEMBLY)

   1. Disconnect the T18 rear light assembly LH connector and T17 rear light assembly RH connector.

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

      Standard Resistance
      LH Side Tester Connection Condition Specified Condition 1M-1(BKLP) - T18-2(B) Always Below 1 Ω
      RH Side Tester Connection Condition Specified Condition 1M-1(BKLP) - T17-2(B) Always Below 1 Ω

   NG

   REPAIR OR REPLACE HARNESS AND CONNECTOR

   OK

5. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - ENGINE ROOM JUNCTION BLOCK ASSEMBLY)

   1. Disconnect the A38 power management control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition 1F-9(BLPS) - A38-15(BL) Always Below 1 Ω 1F-9(BLPS) - Body ground Always 10 kΩ or higher

   NG

   REPAIR OR REPLACE HARNESS AND CONNECTOR

   OK

6. CHECK ENGINE ROOM JUNCTION BLOCK ASSEMBLY

   1. Replace the engine room junction block assembly with a new or a known good one Click here.

      OK
      The back-up lights operate normally.

   NG

   REPLACE POWER MANAGEMENT CONTROL ECU Click here

   OK

   END (ENGINE ROOM JUNCTION BLOCK ASSEMBLY WAS DEFECTIVE)