Last Modified: 11-20-2023 6.11:8.1.0 Doc ID: RM10000000152K4
Model Year Start: 2018 Model: Camry HV Prod Date Range: [07/2017 - 09/2019]
Title: TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: TERMINALS OF ECU; 2018 - 2019 MY Camry HV [07/2017 - 09/2019]

TERMINALS OF ECU

CHECK TIRE PRESSURE WARNING ECU AND RECEIVER

(a) Disconnect the R9 tire pressure warning ECU and receiver connector and measure the voltage or resistance on the wire harness side.

*a

Front view of wire harness connector

(to Tire Pressure Warning ECU and Receiver)

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

R9-1 (IG) - R9-12 (GND)

LA-B - BR*2

LA-B - W-B*3

IG power source

Power switch on (IG)

10 to 16 V

R9-7 (+B) - R9-12 (GND)

LA-R - BR*2

LA-R - W-B*3

Power supply (from auxiliary battery)

Always

10 to 16 V

R9-9 (CANH) - R9-10 (CANL)*1

L - W

CAN communication line

Power switch off

54 to 69 Ω

R9-12 (GND) - Body ground

BR - Body ground*2

W-B - Body ground*3

Ground

Always

Below 1 Ω

  • *1: w/ Tire Inflation Pressure Display Function
  • *2: Before Aug. 2018 Production
  • *3: From Aug. 2018 Production

(b) Connect the R9 tire pressure warning ECU and receiver connector.

(c) Measure the voltage according to the value(s) in the table below. If the result is not as specified, the ECU may be malfunctioning.

HINT:

Measure the values on the wire harness side while the connector is connected.

*a

Component with harness connected

(Tire Pressure Warning ECU and Receiver)

-

-

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

R9-3 (CLSW) - R9-12 (GND)

SB - BR*1

SB - W-B*2

Tire pressure warning reset switch

  • Power switch on (IG)
  • Steering pad switch assembly operated, "Set Pressure" selected on the multi-information display and "OK" switch (steering pad switch assembly) pressed and held

Below 1.5 V

  • Power switch on (IG)
  • "OK" switch (steering pad switch assembly) off

8 to 15 V

R9-4 (RDA) - R9-12 (GND)

GR - BR*1

GR - W-B*2

Output signals

Power switch on (IG)

Pulse generation (see waveform 1)

R9-5 (PRG) - R9-12 (GND)

R - BR*1

R - W-B*2

Input signals

Power switch on (IG)

Pulse generation (see waveform 1)

  • *1: Before Aug. 2018 Production
  • *2: From Aug. 2018 Production

(d) Using an oscilloscope, check waveform 1.

*a

Example

*b

GND

Waveform 1:

Item

Contents

Terminal

R9-4 (RDA) - R9-12 (GND)

R9-5 (PRG) - R9-12 (GND)

Tool setting

5 V/DIV, 5 ms./DIV.

Vehicle condition

Power switch on (IG)

HINT:

The waveform shown in the illustration is an example. If the tester displays a waveform that alternates between high and low, where high is a voltage that is between the IG power source voltage and a voltage 2.2 V lower than the IG power source voltage, and where low is a voltage of between 0 and 1.2 V, the ECU can be judged normal.