No.9 BRIGHTNESS LEVEL OF RVM WARNING INDICATOR LIGHTS IS TOO HIGH OR LOW [REAR VEHICLE MONITORING SYSTEM]

id0903z7994800

Description

• RVM warning indicator lights brightness level is low in the daytime (headlights off) (correct level is retained at night)

• RVM warning indicator lights brightness level is high at night (headlights on) (correct level is retained in the daytime)

• RVM warning indicator lights brightness level is low during dimmer cancel function operation (correct level is retained while dimmer cancel function is not operating)

• RVM warning indicator lights brightness level is high while dimmer cancel function is not operating (correct level is retained during dimmer cancel function operation)

Possible Causes

• Rear vehicle monitoring control module (RH) does not receive correct TNS switch signal from BCM

― Open circuit in wiring harness between TNS switch (light switch) terminal D and BCM terminal 3O

― Open circuit in wiring harness between TNS switch (light switch) terminal B and ground

― Short circuit to ground in wiring harness between TNS switch (light switch) terminal D and BCM terminal 3O

― TNS switch (light switch) malfunction (stuck)

― BCM malfunction

― Communication error between BCM and rear vehicle monitoring control module (RH)

• Rear vehicle monitoring control module (RH) does not receive dimmer cancel signal correctly from instrument cluster

― Communication error between instrument cluster and rear vehicle monitoring control module (RH)

― Rear vehicle monitoring control module (RH) malfunction (Dimmer cancel signal is not received)

― Instrument cluster malfunction (Dimmer cancel signal is not output)

• Rear vehicle monitoring control module (LH) does not receive TNS switch signal and dimmer cancel signal from rear vehicle monitoring control module (RH).

― Communication error between rear vehicle monitoring control modules (RH and LH)

Diagnostic Procedure

Warning

• When performing a road test, always verify the safety of the surrounding area before performing the test.

• To assure safety, perform a road test using two people when the vehicle is being driven. (One drives the vehicle and the other operates the M-MDS.)

• Do not perform a road test at a speed which exceeds the legal speed limit.

Step

Inspection

Action

1

VERIFY DTCs

•  Retrieve DTCs from rear vehicle monitoring system and BCM using the M-MDS.
(See DTC INSPECTION [REAR VEHICLE MONITORING SYSTEM].)

(See DTC INSPECTION [BCM].)

•  Are any DTCs displayed?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [REAR VEHICLE MONITORING SYSTEM].)

(See DTC TABLE [BCM].)

No

Go to the next step.

2

DETERMINE IF MALFUNCTION CAUSE IS INPUT SIGNAL OR RVM WARNING INDICATOR LIGHTS ILLUMINATION CIRCUIT RELATED

•  Monitor the following rear vehicle monitoring system PIDs using the M-MDS:
(See PID/DATA MONITOR INSPECTION [REAR VEHICLE MONITORING SYSTEM].)

―  OP_BRT_R

―  OP_BRT_L

•  Perform the ON/OFF operation of the headlight switch (TNS switch) and the instrument cluster dimmer cancel function.

Note

•  While the dimmer function is canceled, the PID monitoring value increases (brighter) with the headlights on.

•  Does the monitoring value change according to headlight switch and dimmer cancel operation?

Yes

Replace the rear vehicle monitoring control module (LH).

(See REAR VEHICLE MONITORING CONTROL MODULE REMOVAL/INSTALLATION.)

No

Go to the next step.

3

VERIFY INSTRUMENT CLUSTER DIMMER CANCEL FUNCTION OPERATION

•  Verify that the dimmer cancel function of the instrument cluster is operating correctly.

•  Is the dimmer release function operating correctly?

Yes

Go to the next step.

No

Replace the instrument cluster.

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

4

VERIFY TNS SIGNAL

•  Turn on the light switch.

•  Measure the terminal voltage at BCM terminal 3O.
(See BODY CONTROL MODULE (BCM) INSPECTION.)

•  Is the voltage normal?

Yes

Replace the rear vehicle monitoring control module (RH).

(See REAR VEHICLE MONITORING CONTROL MODULE REMOVAL/INSTALLATION.)

No

Go to the next step.

5

INSPECT TNS SIGNAL WIRING HARNESS

•  Switch the ignition to off (LOCK).

•  Inspect the wiring harness between the following terminals for an open or short circuit.

―  Between light switch terminal D and BCM terminal 3O

―  Light switch terminal B and ground

•  Is the wiring harness normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning part.

6

INSPECT LIGHT SWITCH

•  Inspect the light switch.
(See LIGHT SWITCH INSPECTION.)

•  Is the light switch normal?

Yes

Replace the BCM.

(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

No

Replace the light switch.

(See LIGHT SWITCH REMOVAL/INSTALLATION.)

Step	Inspection		Action
1	VERIFY DTCs • Retrieve DTCs from rear vehicle monitoring system and BCM using the M-MDS. (See DTC INSPECTION [REAR VEHICLE MONITORING SYSTEM].) (See DTC INSPECTION [BCM].) • Are any DTCs displayed?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [REAR VEHICLE MONITORING SYSTEM].) (See DTC TABLE [BCM].)
1		No	Go to the next step.
2	DETERMINE IF MALFUNCTION CAUSE IS INPUT SIGNAL OR RVM WARNING INDICATOR LIGHTS ILLUMINATION CIRCUIT RELATED • Monitor the following rear vehicle monitoring system PIDs using the M-MDS: (See PID/DATA MONITOR INSPECTION [REAR VEHICLE MONITORING SYSTEM].) ― OP_BRT_R ― OP_BRT_L • Perform the ON/OFF operation of the headlight switch (TNS switch) and the instrument cluster dimmer cancel function. Note • While the dimmer function is canceled, the PID monitoring value increases (brighter) with the headlights on. • Does the monitoring value change according to headlight switch and dimmer cancel operation?	Yes	Replace the rear vehicle monitoring control module (LH). (See REAR VEHICLE MONITORING CONTROL MODULE REMOVAL/INSTALLATION.)
2		No	Go to the next step.
3	VERIFY INSTRUMENT CLUSTER DIMMER CANCEL FUNCTION OPERATION • Verify that the dimmer cancel function of the instrument cluster is operating correctly. • Is the dimmer release function operating correctly?	Yes	Go to the next step.
3		No	Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
4	VERIFY TNS SIGNAL • Turn on the light switch. • Measure the terminal voltage at BCM terminal 3O. (See BODY CONTROL MODULE (BCM) INSPECTION.) • Is the voltage normal?	Yes	Replace the rear vehicle monitoring control module (RH). (See REAR VEHICLE MONITORING CONTROL MODULE REMOVAL/INSTALLATION.)
4		No	Go to the next step.
5	INSPECT TNS SIGNAL WIRING HARNESS • Switch the ignition to off (LOCK). • Inspect the wiring harness between the following terminals for an open or short circuit. ― Between light switch terminal D and BCM terminal 3O ― Light switch terminal B and ground • Is the wiring harness normal?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning part.
6	INSPECT LIGHT SWITCH • Inspect the light switch. (See LIGHT SWITCH INSPECTION.) • Is the light switch normal?	Yes	Replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
6		No	Replace the light switch. (See LIGHT SWITCH REMOVAL/INSTALLATION.)