PRE-COLLISION SYSTEM Heater Relay Circuit

DESCRIPTION

The pre-collision city sensor turns the pre-collision city heater on and off by operating the TSS C HTR relay (relay).

WIRING DIAGRAM

A002NQJE01

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (PRE-COLLISION CITY HEATER POWER SOURCE CIRCUIT)


    1. A002OVYC07
      *a

      Front view of wire harness connector

      (to Pre-collision City Heater Wire)

      Disconnect the Z1 pre-collision city heater wire connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Z1-1 (IG) - Body ground Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V

    3. Connect the Z1 pre-collision city heater wire connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (PRE-COLLISION CITY HEATER POWER SOURCE CIRCUIT)

    OK

  2. CHECK TERMINAL VOLTAGE (GND TERMINAL)


    1. A002NS8C03
      *a

      Component with harness connected

      (Pre-collision City Heater Wire)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Z1-2 (GND) - Body ground Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT PRE-COLLISION CITY HEATER WIRE Click here

    OK

  3. INSPECT TSS C HTR RELAY (RELAY)


    1. Remove the TSS C HTR relay (relay).

    2. Inspect the TSS C HTR relay (relay).

      Click here

    3. Install the TSS C HTR relay (relay).

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE TSS C HTR RELAY (RELAY)

    OK

  4. CHECK HARNESS AND CONNECTOR (PRE-COLLISION CITY HEATER WIRE - TSS C HTR RELAY (RELAY) AND PRE-COLLISION CITY SENSOR)


    1. Turn the ignition switch off.

    2. Disconnect the Z1 pre-collision city heater wire connector.

    3. Disconnect the Q12 pre-collision city sensor connector.

    4. Remove the TSS C HTR relay (relay).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Z1-2 (GND) - TSS C HTR relay (relay) holder terminal 3 Always Below 1 Ω
      Z1-2 (GND) - Q12-1 (SPR) Always Below 1 Ω
      Q12-1 (SPR) - TSS C HTR relay (relay) holder terminal 3 Always Below 1 Ω
      Z1-2 (GND), Q12-1 (SPR) or TSS C HTR relay (relay) holder terminal 3 - Body ground Always 10 kΩ or higher

    6. Connect the Z1 pre-collision city heater wire connector.

    7. Connect the Q12 pre-collision city sensor connector.

    8. Install the TSS C HTR relay (relay).

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (PRE-COLLISION CITY HEATER WIRE - TSS C HTR RELAY (RELAY) OR PRE-COLLISION CITY SENSOR)

    OK

  5. CHECK HARNESS AND CONNECTOR (TSS C HTR RELAY (RELAY) - BODY GROUND)


    1. Remove the TSS C HTR relay (relay).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      TSS C HTR relay (relay) holder terminal 5 - Body ground Always Below 1 Ω

    3. Install the TSS C HTR relay (relay).

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE PRE-COLLISION CITY HEATER Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (TSS C HTR RELAY (RELAY) - BODY GROUND)

  6. INSPECT PRE-COLLISION CITY HEATER WIRE


    1. Disconnect the Z1 pre-collision city heater wire connector.

    2. Disconnect terminal A and B.

    3. A002QW9C02
      *a Pre-collision City Heater Wire
      A Terminal (Wiring Color "R")
      B Terminal (Wiring Color "W-B")

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Z1-1 (IG) - A Always Below 1 Ω
      Z1-2 (GND) - B Always Below 1 Ω
      Z1-1 (IG) or A - Body ground Always 10 kΩ or higher
      Z1-2 (GND) or B - Body ground Always 10 kΩ or higher

    4. Connect the Z1 pre-collision city heater wire connector.

    5. Connect terminal A and B.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE PRE-COLLISION CITY HEATER Click here

    NG

    REPLACE PRE-COLLISION CITY HEATER WIRE Click here