PRE-CRASH SAFETY SYSTEM Heater Relay Circuit

DESCRIPTION

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

WIRING DIAGRAM

A004QN3E27

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-CRASH SAFETY CITY HEATERPOWER SOURCE CIRCUIT)


    1. A004SQZE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Pre-crash Safety City Heater Wire)

      Disconnect the pre-crash safety city heater wire connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K17-1 (IG) - Body ground Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (PRE-CRASH SAFETY CITY HEATERPOWER SOURCE CIRCUIT)

    OK

  2. CHECK TERMINAL VOLTAGE (GND TERMINAL)


    1. Reconnect the pre-crash safety city heater wire connector.

    2. A004O0PE02
      Text in Illustration
      *a

      Component with harness connected

      (Pre-crash Safety City Heater Wire)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K17-2 (GND) - Body ground Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V

    NG

    INSPECT PRE-CRASH SAFETY CITY HEATER WIRE Click here

    OK

  3. INSPECT TSS C HTR RELAY (PRE-CRASH SAFETY CITY HEATER RELAY)


    1. Remove the TSS C HTR relay (pre-crash safety city heater relay).

    2. Inspect the TSS C HTR relay (pre-crash safety city heater relay) Click here.


    NG

    REPLACE TSS C HTR RELAY (PRE-CRASH SAFETY CITY HEATER RELAY)

    OK

  4. CHECK HARNESS AND CONNECTOR (PRE-CRASH SAFETY CITY HEATERWIRE - PRE-CRASH SAFETY CITY SENSOR AND TSS C HTR RELAY (PRE-CRASH SAFETY CITY HEATER RELAY))


    1. Disconnect the K17 pre-crash safety city heater wire connector.

    2. Disconnect the K16 pre-crash safety city sensor connector.

    3. Remove the TSS C HTR relay (pre-crash safety city heater relay).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K17-2 (GND) - TSS C HTR relay (pre-crash safety city heater relay) holder terminal 3 Always Below 1 Ω
      K17-2 (GND) - K16-1 (SPR) Always Below 1 Ω
      K16-1 (SPR) - TSS C HTR relay (pre-crash safety city heater relay) holder terminal 3 Always Below 1 Ω
      K17-2 (GND), K16-1 (SPR) or TSS C HTR relay (pre-crash safety city heater relay) holder terminal 3 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (PRE-CRASH SAFETY CITY HEATERWIRE - PRE-CRASH SAFETY CITY SENSOR OR TSS C HTR RELAY (PRE-CRASH SAFETY CITY HEATER RELAY))

    OK

  5. CHECK HARNESS AND CONNECTOR (TSS C HTR RELAY (PRE-CRASH SAFETY CITY HEATER RELAY) - BODY GROUND)


    1. Remove the TSS C HTR relay (pre-crash safety city heater 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 (pre-crash safety city heater relay) holder terminal 5 - Body ground Always Below 1 Ω

    OK

    REPLACE PRE-CRASH SAFETY CITY HEATER

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (TSS C HTR RELAY (PRE-CRASH SAFETY CITY HEATER RELAY) - BODY GROUND)

  6. INSPECT PRE-CRASH SAFETY CITY HEATER WIRE


    1. A004QLIE01
      Text in Illustration
      *a Pre-crash Safety City Heater Wire
      A Terminal (Wiring Color "R")
      B Terminal (Wiring Color "W-B")

      Disconnect the pre-crash safety city heater wire connector, terminal A and B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K17-1 (IG) - A Always Below 1 Ω
      K17-2 (GND) - B Always Below 1 Ω
      K17-1 (IG) or A - Body ground Always 10 kΩ or higher
      K17-2 (GND) or B - Body ground Always 10 kΩ or higher

    OK

    REPLACE PRE-CRASH SAFETY CITY HEATER Click here

    NG

    REPLACE PRE-CRASH SAFETY CITY HEATER WIRE Click here