Heater Relay Circuit [06/2017 - ]: Procedure

1. Disconnect the Q9 pre-collision city heater wire connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Pre-collision City Heater Wire)

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   Q9-1 (IG) - Body ground	Power switch on (IG)	11 to 14 V
   	Power switch off	Below 1 V

3. Connect the Q9 pre-collision city heater wire connector.

Result: 

NG 

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

Result: 

OK 

See step  2

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   Q9-2 (GND) - Body ground	Power switch on (IG)	11 to 14 V
   	Power switch off	Below 1 V

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Rear view of wire harness connector (to Pre-collision City Heater Wire)

Result: 

NG 

See step  6

Result: 

OK 

See step  3

1. Remove the TSSC HTR relay.
2. Inspect the TSSC HTR relay.

   Refer to INSPECTION [06/2017 - ]

3. Install the TSSC HTR relay.

Result: 

NG 

REPLACE TSSC HTR RELAY 

Result: 

OK 

See step  4

1. Turn the power switch off.
2. Disconnect the Q9 pre-collision city heater wire connector.
3. Remove the TSSC HTR relay.
4. w/o Sliding Roof:
   1. Disconnect the Q7 pre-collision city sensor connector.
   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      Q9-2 (GND) - TSSC HTR relay holder terminal 3	Always	Below 1 Ω
      Q9-2 (GND) - Q7-1 (SPR)	Always	Below 1 Ω
      Q7-1 (SPR) - TSSC HTR relay holder terminal 3	Always	Below 1 Ω
      Q9-2 (GND), Q7-1 (SPR) or TSSC HTR relay holder terminal 3 - Body ground	Always	10 kΩ or higher

   3. Connect the Q7 pre-collision city sensor connector.
5. w/ Sliding Roof
   1. Connect the Q8 pre-collision city sensor connector.
   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      Q9-2 (GND) - TSSC HTR relay holder terminal 3	Always	Below 1 Ω
      Q9-2 (GND) - Q8-1 (SPR)	Always	Below 1 Ω
      Q8-1 (SPR) - TSSC HTR relay holder terminal 3	Always	Below 1 Ω
      Q9-2 (GND), Q8-1 (SPR) or TSSC HTR relay holder terminal 3 - Body ground	Always	10 kΩ or higher

   3. Connect the Q8 pre-collision city sensor connector.
6. Install the TSSC HTR relay.
7. Connect the Q9 pre-collision city heater wire connector.

Result: 

NG 

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

Result: 

OK 

See step  5

1. Remove the TSSC HTR relay.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   TSSC HTR relay holder terminal 5 - Body ground	Always	Below 1 Ω

3. Install the TSSC HTR relay.

Result: 

OK 

REPLACE PRE-COLLISION CITY HEATER. Refer to  COMPONENTS [06/2017 - ] 

Result: 

NG 

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

1. Remove the pre-collision city heater wire.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Q9-1 (IG) - A	Always	Below 1 Ω
   Q9-2 (GND) - B	Always	Below 1 Ω
   Q9-1 (IG) or A - Body ground	Always	10 kΩ or higher
   Q9-2 (GND) or B - Body ground	Always	10 kΩ or higher

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Pre-collision City Heater Wire)
   A	Terminal (Wiring Color "R")
   B	Terminal (Wiring Color "W-B")

3. Install the pre-collision city heater wire.

Result: 

OK 

REPLACE PRE-COLLISION CITY HEATER. Refer to  COMPONENTS [06/2017 - ] 

Result: 

MG 

REPLACE PRE-COLLISION CITY HEATER WIRE. Refer to  COMPONENTS [06/2017 - ]