TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: C2179; Tire Pressure Monitor ECU Communication Stop; 2019 - 2022 MY RAV4 RAV4 HV [11/2018

Last Modified: 05-08-2025	6.11:8.1.0	Doc ID: RM100000001ES1H
Model Year Start: 2019	Model: RAV4	Prod Date Range: [11/2018 - 10/2022]
Title: TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: C2179; Tire Pressure Monitor ECU Communication Stop; 2019 - 2022 MY RAV4 RAV4 HV [11/2018 - 10/2022]

DTC

C2179

Tire Pressure Monitor ECU Communication Stop

DESCRIPTION

The main body ECU (multiplex network body ECU) sends signals to the tire pressure warning ECU and receiver via a direct line.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
C2179	Tire Pressure Monitor ECU Communication Stop	Communication between the main body ECU (multiplex network body ECU) and tire pressure warning ECU and receiver is interrupted for 10 seconds or more.	Main body ECU (Multiplex network body ECU) Wire harness or connector Tire pressure warning ECU and receiver	-

NOTICE:

When replacing the tire pressure warning ECU and receiver, read the transmitter IDs and number of the transmitters (4 or 5) stored in the old ECU using the Techstream and write them down before removal.
It is necessary to perform initialization after registration of the transmitter IDs into the tire pressure warning ECU and receiver after the ECU has been replaced.
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.*
- for HV Model:
  Click here
- for Gasoline Model:
  Click here

1.	INSPECT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (OUTPUT WAVEFORM)

(a) Using an oscilloscope, check the waveform.

NOTICE:

With the connector connected, check from the backside of the connector.

Standard Voltage:

Tester Connection	Tool Setting Range	Condition	Specified Condition
G45-11 (PRG) - Body ground	5 V/DIV.5 ms./DIV.	Ignition switch ON	Waveform generation

Component with harness connected

(Main Body ECU (Multiplex Network Body ECU))

GND

Result	Proceed to
Waveform is as shown in the illustration. (Waveform alternates between 9.8 V or higher and 1.2 V or less)	A
Waveform does not change from 9.8 V or higher	B
Waveform does not change from 1.2 V or less	C

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

2.	CHECK TERMINAL VOLTAGE (TIRE PRESSURE WARNING ECU AND RECEIVER OUTPUT)

(a) Disconnect the main body ECU (multiplex network body ECU) connector.

(b) Turn the ignition switch to ON.

Standard Voltage:

Tester Connection	Condition	Specified Condition
G45-11 (PRG) - Body ground	Ignition switch ON	9.8 V or higher

*a	Front view of wire harness connector (to Main Body ECU (Multiplex Network Body ECU))

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

3.	CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Turn the ignition switch off.

(b) Disconnect the M8 tire pressure warning ECU and receiver connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
M8-5 (PRG) - G45-11 (PRG)	Always	Below 1 Ω
M8-5 (PRG) or G45-11 (PRG) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (POWER SUPPLY - TIRE PRESSURE WARNING ECU AND RECEIVER)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
M8-7 (+B) - Body ground	Always	10 to 16 V
M8-1 (IG) - Body ground	Ignition switch ON	10 to 16 V

*a	Front view of wire harness connector (to Tire Pressure Warning ECU and Receiver)

NG (w/ Stop and Start System)

INSPECT STOP AND START SYSTEM (BACKUP BOOST CONVERTER CIRCUIT)

NG (w/o Stop and Start System)

REPAIR OR REPLACE HARNESS OR CONNECTOR