DTC U0186:00 [CONNECTIVITY MASTER UNIT]

id1602a1007700

Outline

System malfunction location

Communication error with audio amplifier

Detection condition

•  The connectivity master unit (CMU) detects a communication interruption or communication error with the audio amplifier for approx. 6 s.

Fail-safe

Not applicable

Possible cause

•  Connectivity master unit (CMU) malfunction

•  Audio amplifier connector or terminal malfunction

•  Malfunction in connectivity master unit (CMU) connector or terminal

•  Short to ground in audio amplifier CAN communication circuit

•  Short to power supply in audio amplifier CAN communication circuit

•  Open circuit in audio amplifier CAN communication circuit

•  Short circuit between audio amplifier CAN communication circuits

•  Audio amplifier malfunction

System malfunction location	Communication error with audio amplifier
Detection condition	• The connectivity master unit (CMU) detects a communication interruption or communication error with the audio amplifier for approx. 6 s.
Fail-safe	Not applicable
Possible cause	• Connectivity master unit (CMU) malfunction • Audio amplifier connector or terminal malfunction • Malfunction in connectivity master unit (CMU) connector or terminal • Short to ground in audio amplifier CAN communication circuit • Short to power supply in audio amplifier CAN communication circuit • Open circuit in audio amplifier CAN communication circuit • Short circuit between audio amplifier CAN communication circuits • Audio amplifier malfunction

*1 :Without Bose^®

*2 :With Bose^®

Diagnostic Procedure

Step

Inspection

Results

Action

1

INSPECT BODY CONTROL MODULE (BCM) AND CONNECTIVITY MASTER UNIT (CMU) FOR MALFUNCTION

•  Perform the DTC inspection for the body control module (BCM) and the connectivity master unit (CMU).
(Refer to the [DTC INSPECTION] in the workshop manual)

•  Are any communication error-related DTCs other than this DTC displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(Refer to the [DTC TABLE [BODY CONTROL MODULE (BCM)]] in the workshop manual)

(See DTC TABLE [CONNECTIVITY MASTER UNIT (E)].)

No

Go to the next step.

2

VERIFY SOUND DURING CRANKING

Note

•  If a CAN signal can be normally received during cranking, the audio amplifier mutes the sound.

•  Switch the ignition to ACC.

•  Output audio in the cabin using the audio amplifier. (Such as radio, navigation)

•  Crank the engine.

•  Was the audio muted?

Yes

Go to the next step.

No

Go to Step 4.

3

INSPECT CONNECTIVITY MASTER UNIT (CMU) FOR MALFUNCTION DEPENDING ON REPEATABILITY

•  Clear the DTC recorded in the memory.
(Refer to the [CLEARING DTC] in the workshop manual)

•  Because the connectivity master unit (CMU) is in sleep mode, perform the following operation.

―  Switch the ignition OFF.

―  Remove all of the remote transmitters from the vehicle, lock all doors, and then wait for 10 min.

•  Perform the DTC inspection for the connectivity master unit (CMU).
(Refer to the [DTC INSPECTION] in the workshop manual)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW] in the workshop manual)

If the CAN communication is normal, replace the connectivity master unit (CMU) and perform the repair completion verification.

(Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual)

No

Go to repair completion verification 2.

4

INSPECT AUDIO AMPLIFIER CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(Refer to the [CONNECTOR INSPECTION] in the workshop manual)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

5

INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(Refer to the [CONNECTOR INSPECTION] in the workshop manual)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

6

INSPECT AUDIO AMPLIFIER CAN COMMUNICATION CIRCUIT FOR SHORT TO GROUND

•  Inspect the applicable circuit for a short to ground.
(Refer to the [CIRCUIT INSPECTION] in the workshop manual)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

7

INSPECT AUDIO AMPLIFIER CAN COMMUNICATION CIRCUIT FOR SHORT TO POWER SUPPLY

•  Inspect the applicable circuit for a short to power supply.
(Refer to the [CIRCUIT INSPECTION] in the workshop manual)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

8

INSPECT AUDIO AMPLIFIER CAN COMMUNICATION CIRCUIT FOR OPEN CIRCUIT

•  Inspect the applicable circuit for an open circuit.
(Refer to the [CIRCUIT INSPECTION] in the workshop manual)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

9

INSPECT AUDIO AMPLIFIER CAN COMMUNICATION CIRCUITS FOR SHORT CIRCUIT

•  Inspect the applicable circuits for a short circuit.
(Refer to the [CIRCUIT INSPECTION] in the workshop manual)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

Repair completion verification 1

VERIFY THAT VEHICLE IS REPAIRED

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Clear the DTC recorded in the memory.
(Refer to the [CLEARING DTC] in the workshop manual)

•  Perform the DTC inspection for the connectivity master unit (CMU).
(Refer to the [DTC INSPECTION] in the workshop manual)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW] in the workshop manual)

If the CAN communication is normal, perform the diagnosis from Step 1.

•  If the malfunction recurs, replace the audio amplifier, then go to the next step.
(Refer to the [AUDIO AMPLIFIER REMOVAL/INSTALLATION] in the workshop manual)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTCs ARE DISPLAYED

•  Perform the DTC inspection.
(Refer to the [DTC INSPECTION] in the workshop manual)

•  Are other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	INSPECT BODY CONTROL MODULE (BCM) AND CONNECTIVITY MASTER UNIT (CMU) FOR MALFUNCTION • Perform the DTC inspection for the body control module (BCM) and the connectivity master unit (CMU). (Refer to the [DTC INSPECTION] in the workshop manual) • Are any communication error-related DTCs other than this DTC displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (Refer to the [DTC TABLE [BODY CONTROL MODULE (BCM)]] in the workshop manual) (See DTC TABLE [CONNECTIVITY MASTER UNIT (E)].)
1		No	Go to the next step.
2	VERIFY SOUND DURING CRANKING Note • If a CAN signal can be normally received during cranking, the audio amplifier mutes the sound. • Switch the ignition to ACC. • Output audio in the cabin using the audio amplifier. (Such as radio, navigation) • Crank the engine. • Was the audio muted?	Yes	Go to the next step.
2		No	Go to Step 4.
3	INSPECT CONNECTIVITY MASTER UNIT (CMU) FOR MALFUNCTION DEPENDING ON REPEATABILITY • Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC] in the workshop manual) • Because the connectivity master unit (CMU) is in sleep mode, perform the following operation. ― Switch the ignition OFF. ― Remove all of the remote transmitters from the vehicle, lock all doors, and then wait for 10 min. • Perform the DTC inspection for the connectivity master unit (CMU). (Refer to the [DTC INSPECTION] in the workshop manual) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW] in the workshop manual) If the CAN communication is normal, replace the connectivity master unit (CMU) and perform the repair completion verification. (Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual)
3		No	Go to repair completion verification 2.
4	INSPECT AUDIO AMPLIFIER CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (Refer to the [CONNECTOR INSPECTION] in the workshop manual) • Are the connector and terminal normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification.
5	INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (Refer to the [CONNECTOR INSPECTION] in the workshop manual) • Are the connector and terminal normal?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification.
6	INSPECT AUDIO AMPLIFIER CAN COMMUNICATION CIRCUIT FOR SHORT TO GROUND • Inspect the applicable circuit for a short to ground. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) • Is the circuit normal?	Yes	Go to the next step.
6		No	Repair or replace the malfunctioning location and perform the repair completion verification.
7	INSPECT AUDIO AMPLIFIER CAN COMMUNICATION CIRCUIT FOR SHORT TO POWER SUPPLY • Inspect the applicable circuit for a short to power supply. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) • Is the circuit normal?	Yes	Go to the next step.
7		No	Repair or replace the malfunctioning location and perform the repair completion verification.
8	INSPECT AUDIO AMPLIFIER CAN COMMUNICATION CIRCUIT FOR OPEN CIRCUIT • Inspect the applicable circuit for an open circuit. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) • Is the circuit normal?	Yes	Go to the next step.
8		No	Repair or replace the malfunctioning location and perform the repair completion verification.
9	INSPECT AUDIO AMPLIFIER CAN COMMUNICATION CIRCUITS FOR SHORT CIRCUIT • Inspect the applicable circuits for a short circuit. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) • Is the circuit normal?	Yes	Go to the next step.
9		No	Repair or replace the malfunctioning location and perform the repair completion verification.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC] in the workshop manual) • Perform the DTC inspection for the connectivity master unit (CMU). (Refer to the [DTC INSPECTION] in the workshop manual) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW] in the workshop manual) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the audio amplifier, then go to the next step. (Refer to the [AUDIO AMPLIFIER REMOVAL/INSTALLATION] in the workshop manual)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs ARE DISPLAYED • Perform the DTC inspection. (Refer to the [DTC INSPECTION] in the workshop manual) • Are other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.