Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Multi-axis Acceleration Sensor Module "A" Supply Voltage Circuit Voltage Out of Range (C14D71C)

DESCRIPTION

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C14D71C	Multi-axis Acceleration Sensor Module "A" Supply Voltage Circuit Voltage Out of Range	When the +BS terminal voltage is from 9.5 to 17.4 V at a vehicle speed exceeding 3 km/h (2 mph), an acceleration sensor power source malfunction signal is received for 10 seconds or more.	Wire harness and connector Acceleration sensor (airbag sensor assembly) (for Optitron Meter Type) Acceleration sensor (yaw rate and acceleration sensor) (for TFT Meter Type)

WIRING DIAGRAM

for Optitron Meter Type: for TFT Meter Type:

CAUTION / NOTICE / HINT

PROCEDURE

1.	CHECK VEHICLE SPECIFICATION

(a) Check the combination meter assembly.

Click here

Result	Proceed to
for Optitron Meter Type	A
for TFT Meter Type	B

B

GO TO STEP 6

A

2.	CHECK HARNESS AND CONNECTOR (IG2 TERMINAL)

(a) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

*a Front view of wire harness connector (to Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly))

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(c) Disconnect the J142 yaw rate and acceleration sensor (airbag sensor assembly) connector.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(e) Connect the cable to the negative (-) battery terminal.

(f) Turn the engine switch on (IG).

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
J142-36 (IG2) - Body ground	Engine switch on (IG)	11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.	CHECK HARNESS AND CONNECTOR (E1 AND E2 TERMINAL)

(a) Turn the engine switch off.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
J142-33 (E1) - Body ground	1 minute or more after disconnecting the cable from the negative (-) battery terminal	Below 1 Ω
J142-32 (E2) - Body ground	1 minute or more after disconnecting the cable from the negative (-) battery terminal	Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CLEAR DTC

(a) Reconnect the J142 yaw rate and acceleration sensor (airbag sensor assembly) connector.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Operate the Techstream to clear the codes. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

Chassis > Brake/EPB > Clear DTCs

(e) Press the DTC clear button.

(f) Turn the engine switch off.

NEXT

5.	RECONFIRM DTC

(a) Start the engine.

(b) Perform a road test.

(c) Read the DTCs following the prompts on the Techstream. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

Chassis > Brake/EPB > Trouble Codes

(d) Check if the same DTC is output.

Result	Proceed to
DTC C14D71C is not output.	A
DTC C14D71C is output.	B

A

USE SIMULATION METHOD TO CHECK

B

REPLACE AIRBAG SENSOR ASSEMBLY

6.	CHECK HARNESS AND CONNECTOR (IG TERMINAL)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors. OK: The connector is securely connected.

*a Front view of wire harness connector (to Yaw Rate and Acceleration Sensor)

(b) Disconnect the J19 yaw rate and acceleration sensor connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(d) Turn the engine switch on (IG).

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
J19-4 (IG) - Body ground	Engine switch on (IG)	11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.	CHECK HARNESS AND CONNECTOR (GND TERMINAL)

(a) Turn the engine switch off.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
J19-1 (GND) - Body ground	1 minute or more after disconnecting the cable from the negative (-) battery terminal	Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

CLEAR DTC

(a) Reconnect the J19 yaw rate and acceleration sensor connector.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Operate the Techstream to clear the codes. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

Chassis > Brake/EPB > Clear DTCs

(e) Press the DTC clear button.

(f) Turn the engine switch off.

NEXT

9.	RECONFIRM DTC

(a) Start the engine.

(b) Perform a road test.

(c) Read the DTCs following the prompts on the Techstream. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

Chassis > Brake/EPB > Trouble Codes

(d) Check if the same DTC is output.

Result	Proceed to
DTC C14D71C is not output.	A
DTC C14D71C is output.	B

A

USE SIMULATION METHOD TO CHECK

B

REPLACE YAW RATE AND ACCELERATION SENSOR