PRE-COLLISION SYSTEM Heater Relay Circuit

DTC Code DTC Name
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

C364773E01

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. C367313C07

      *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. C369010C03

      *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 WIREClick 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. C367437C02

      *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