DTC B11BA:13 [CONNECTIVITY MASTER UNIT]

id1602a1000600

Outline

System malfunction location

Steering switch circuit malfunction

Detection condition

•  The connectivity master unit (CMU) detects an open circuit or a short to power supply in the steering switch circuit.

Fail-safe

•  The steering switch operation is disabled However, if a different switch presents the same condition when it is pressed as a result of the malfunction, a mis-operation will occur.

Possible cause

•  Clock spring connector or terminal malfunction

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

•  Short to power supply, short to ground, open circuit in steering switch signal circuit (audio)

•  Short to power supply, short to ground, open circuit in steering switch signal circuit (hands-free)

•  Short to power supply, short to ground in steering switch ground circuit

•  Short circuit between steering switch signal circuits (audio), signal circuits (hands-free), ground circuits

•  Steering switch malfunction

•  Clock spring malfunction

•  Connectivity master unit (CMU) malfunction

System malfunction location	Steering switch circuit malfunction
Detection condition	• The connectivity master unit (CMU) detects an open circuit or a short to power supply in the steering switch circuit.
Fail-safe	• The steering switch operation is disabled However, if a different switch presents the same condition when it is pressed as a result of the malfunction, a mis-operation will occur.
Possible cause	• Clock spring connector or terminal malfunction • Malfunction in connectivity master unit (CMU) connector or terminal • Short to power supply, short to ground, open circuit in steering switch signal circuit (audio) • Short to power supply, short to ground, open circuit in steering switch signal circuit (hands-free) • Short to power supply, short to ground in steering switch ground circuit • Short circuit between steering switch signal circuits (audio), signal circuits (hands-free), ground circuits • Steering switch malfunction • Clock spring malfunction • Connectivity master unit (CMU) malfunction

Diagnostic Procedure

Step

Inspection

Results

Action

1

DETERMINE IF MALFUNCTION IS STEERING SWITCH

•  Switch the ignition ON (engine off or on).

•  Display the [Steering SW Inspection] using the diagnostic assist function.
(See DIAGNOSTIC ASSIST FUNCTION [CONNECTIVITY MASTER UNIT (E)].)

•  Among the following switches, are there any that match the operation results display when the steering switch is operated?

―  Audio system switches (VOL-, VOL+, SEEK-, SEEK+, MUTE)

―  Hands-free system switches (SOURCE, PICK-UP/VOICE, HANG-UP)

Yes

Both audio system switches and hands-free system switches match:

•  Verify that the repairs have been completed.

Only audio system switches match:

•  Go to Step 7.

Only hands-free system switches match:

•  Go to the next step.

No

Go to Step 12.

2

VERIFY CLOCK SPRING (AUDIO SYSTEM) VOLTAGE

•  Switch the ignition ON (engine off).

•  Measure the voltage at clock spring terminal 3J.

•  Is the voltage between 2.68—2.89 V?

Yes

Go to the next step.

No

Voltage exceeds 2.89 V:

•  Go to Step 4.

Voltage is less than 2.68 V:

•  Go to Step 5.

3

INSPECT STEERING SWITCH FOR MALFUNCTION

•  Inspect the applicable part.
(Refer to the [STEERING SWITCH INSPECTION] in the workshop manual)

•  Is the part normal?

Yes

Verify that the repairs have been completed.

No

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

(Refer to the [STEERING SWITCH REMOVAL/INSTALLATION] in the workshop manual)

4

INSPECT STEERING SWITCH SIGNAL CIRCUIT (AUDIO) 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

Verify that the repairs have been completed.

No

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

5

INSPECT STEERING SWITCH SIGNAL CIRCUIT (AUDIO) 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.

6

INSPECT STEERING SWITCH SIGNAL CIRCUIT (AUDIO) 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

Verify that the repairs have been completed.

No

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

7

VERIFY CLOCK SPRING (HANDS-FREE SYSTEM) VOLTAGE

•  Switch the ignition ON (engine off).

•  Measure the voltage at clock spring terminal 3L.

•  Is the voltage between 2.520–2.736 V?

Yes

Go to the next step.

No

Voltage exceeds 2.736 V:

•  Go to Step 9.

Voltage is less than 2.520 V:

•  Go to Step 10.

8

INSPECT STEERING SWITCH FOR MALFUNCTION

•  Inspect the applicable part.
(Refer to the [STEERING SWITCH INSPECTION] in the workshop manual)

•  Is the part normal?

Yes

Verify that the repairs have been completed.

No

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

(Refer to the [STEERING SWITCH REMOVAL/INSTALLATION] in the workshop manual)

9

INSPECT STEERING SWITCH SIGNAL CIRCUIT (HANDS-FREE) 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

Verify that the repairs have been completed.

No

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

10

INSPECT STEERING SWITCH SIGNAL CIRCUIT (HANDS-FREE) 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.

11

INSPECT STEERING SWITCH SIGNAL CIRCUIT (HANDS-FREE) 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

Verify that the repairs have been completed.

No

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

12

VERIFY CLOCK SPRING (AUDIO, HANDS-FREE, AND GROUND SYSTEMS) VOLTAGE

•  Switch the ignition ON (engine off).

•  Measure the voltage at the following terminals.

―  Clock spring terminal 3J

―  Clock spring terminal 3D

―  Clock spring terminal 3L

•  Are the voltage values as follows?

―  Clock spring terminal 3J: 2.68-2.89 V

―  Clock spring terminal 3D: 0 V

―  Clock spring terminal 3L: 2.520-2.736 V

Yes

Go to the next step.

No

Go to Step 15.

13

INSPECT CLOCK SPRING (3A—3N TERMINAL) 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.

14

INSPECT STEERING SWITCH FOR MALFUNCTION

•  Inspect the applicable part.
(Refer to the [STEERING SWITCH INSPECTION] in the workshop manual)

•  Is the part normal?

Yes

Verify that the repairs have been completed.

No

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

(Refer to the [STEERING SWITCH REMOVAL/INSTALLATION] in the workshop manual)

15

VERIFY CONNECTIVITY MASTER UNIT (CMU) (AUDIO, HANDS-FREE, AND GROUND SYSTEMS) VOLTAGE

•  Switch the ignition ON (engine off).

•  Measure the voltage at the following terminals.

―  Connectivity master unit (CMU) terminal 1N

―  Connectivity master unit (CMU) terminal 1L

―  Connectivity master unit (CMU) terminal 1J

•  Are the voltage values as follows?

―  Connectivity master unit (CMU) terminal 1N: 2.68-2.89 V

―  Connectivity master unit (CMU) terminal 1L: 0 V

―  Connectivity master unit (CMU) terminal 1J: 2.520-2.736 V

Yes

Go to the next step.

No

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)

16

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.

17

INSPECT CLOCK SPRING (TERMINAL 1A—1N) 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.

18

INSPECT STEERING SWITCH SIGNAL CIRCUIT (AUDIO), SIGNAL CIRCUIT (HANDS-FREE), AND GROUND 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.

19

INSPECT STEERING SWITCH SIGNAL CIRCUIT (AUDIO), SIGNAL CIRCUIT (HANDS-FREE), AND GROUND CIRCUITS 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.

20

INSPECT STEERING SWITCH SIGNAL CIRCUITS (AUDIO), SIGNAL CIRCUITS (HANDS-FREE), AND GROUND 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.

21

INSPECT CLOCK SPRING FOR MALFUNCTION

•  Inspect the applicable part.
(Refer to the [CLOCK SPRING INSPECTION] in the workshop manual)

•  Is the part normal?

Yes

Go to the next step.

No

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

(Refer to the [CLOCK SPRING REMOVAL/INSTALLATION] in the workshop manual)

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 connectivity master unit (CMU), then go to the next step.
(Refer to the [CONNECTIVITY MASTER UNIT (CMU) 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	DETERMINE IF MALFUNCTION IS STEERING SWITCH • Switch the ignition ON (engine off or on). • Display the [Steering SW Inspection] using the diagnostic assist function. (See DIAGNOSTIC ASSIST FUNCTION [CONNECTIVITY MASTER UNIT (E)].) • Among the following switches, are there any that match the operation results display when the steering switch is operated? ― Audio system switches (VOL-, VOL+, SEEK-, SEEK+, MUTE) ― Hands-free system switches (SOURCE, PICK-UP/VOICE, HANG-UP)	Yes	Both audio system switches and hands-free system switches match: • Verify that the repairs have been completed. Only audio system switches match: • Go to Step 7. Only hands-free system switches match: • Go to the next step.
1		No	Go to Step 12.
2	VERIFY CLOCK SPRING (AUDIO SYSTEM) VOLTAGE • Switch the ignition ON (engine off). • Measure the voltage at clock spring terminal 3J. • Is the voltage between 2.68—2.89 V?	Yes	Go to the next step.
2		No	Voltage exceeds 2.89 V: • Go to Step 4. Voltage is less than 2.68 V: • Go to Step 5.
3	INSPECT STEERING SWITCH FOR MALFUNCTION • Inspect the applicable part. (Refer to the [STEERING SWITCH INSPECTION] in the workshop manual) • Is the part normal?	Yes	Verify that the repairs have been completed.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification. (Refer to the [STEERING SWITCH REMOVAL/INSTALLATION] in the workshop manual)
4	INSPECT STEERING SWITCH SIGNAL CIRCUIT (AUDIO) 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	Verify that the repairs have been completed.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification.
5	INSPECT STEERING SWITCH SIGNAL CIRCUIT (AUDIO) 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.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification.
6	INSPECT STEERING SWITCH SIGNAL CIRCUIT (AUDIO) 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	Verify that the repairs have been completed.
6		No	Repair or replace the malfunctioning location and perform the repair completion verification.
7	VERIFY CLOCK SPRING (HANDS-FREE SYSTEM) VOLTAGE • Switch the ignition ON (engine off). • Measure the voltage at clock spring terminal 3L. • Is the voltage between 2.520–2.736 V?	Yes	Go to the next step.
7		No	Voltage exceeds 2.736 V: • Go to Step 9. Voltage is less than 2.520 V: • Go to Step 10.
8	INSPECT STEERING SWITCH FOR MALFUNCTION • Inspect the applicable part. (Refer to the [STEERING SWITCH INSPECTION] in the workshop manual) • Is the part normal?	Yes	Verify that the repairs have been completed.
8		No	Repair or replace the malfunctioning location and perform the repair completion verification. (Refer to the [STEERING SWITCH REMOVAL/INSTALLATION] in the workshop manual)
9	INSPECT STEERING SWITCH SIGNAL CIRCUIT (HANDS-FREE) 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	Verify that the repairs have been completed.
9		No	Repair or replace the malfunctioning location and perform the repair completion verification.
10	INSPECT STEERING SWITCH SIGNAL CIRCUIT (HANDS-FREE) 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.
10		No	Repair or replace the malfunctioning location and perform the repair completion verification.
11	INSPECT STEERING SWITCH SIGNAL CIRCUIT (HANDS-FREE) 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	Verify that the repairs have been completed.
11		No	Repair or replace the malfunctioning location and perform the repair completion verification.
12	VERIFY CLOCK SPRING (AUDIO, HANDS-FREE, AND GROUND SYSTEMS) VOLTAGE • Switch the ignition ON (engine off). • Measure the voltage at the following terminals. ― Clock spring terminal 3J ― Clock spring terminal 3D ― Clock spring terminal 3L • Are the voltage values as follows? ― Clock spring terminal 3J: 2.68-2.89 V ― Clock spring terminal 3D: 0 V ― Clock spring terminal 3L: 2.520-2.736 V	Yes	Go to the next step.
12		No	Go to Step 15.
13	INSPECT CLOCK SPRING (3A—3N TERMINAL) 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.
13		No	Repair or replace the malfunctioning location and perform the repair completion verification.
14	INSPECT STEERING SWITCH FOR MALFUNCTION • Inspect the applicable part. (Refer to the [STEERING SWITCH INSPECTION] in the workshop manual) • Is the part normal?	Yes	Verify that the repairs have been completed.
14		No	Repair or replace the malfunctioning location and perform the repair completion verification. (Refer to the [STEERING SWITCH REMOVAL/INSTALLATION] in the workshop manual)
15	VERIFY CONNECTIVITY MASTER UNIT (CMU) (AUDIO, HANDS-FREE, AND GROUND SYSTEMS) VOLTAGE • Switch the ignition ON (engine off). • Measure the voltage at the following terminals. ― Connectivity master unit (CMU) terminal 1N ― Connectivity master unit (CMU) terminal 1L ― Connectivity master unit (CMU) terminal 1J • Are the voltage values as follows? ― Connectivity master unit (CMU) terminal 1N: 2.68-2.89 V ― Connectivity master unit (CMU) terminal 1L: 0 V ― Connectivity master unit (CMU) terminal 1J: 2.520-2.736 V	Yes	Go to the next step.
15		No	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)
16	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.
16		No	Repair or replace the malfunctioning location and perform the repair completion verification.
17	INSPECT CLOCK SPRING (TERMINAL 1A—1N) 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.
17		No	Repair or replace the malfunctioning location and perform the repair completion verification.
18	INSPECT STEERING SWITCH SIGNAL CIRCUIT (AUDIO), SIGNAL CIRCUIT (HANDS-FREE), AND GROUND 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.
18		No	Repair or replace the malfunctioning location and perform the repair completion verification.
19	INSPECT STEERING SWITCH SIGNAL CIRCUIT (AUDIO), SIGNAL CIRCUIT (HANDS-FREE), AND GROUND CIRCUITS 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.
19		No	Repair or replace the malfunctioning location and perform the repair completion verification.
20	INSPECT STEERING SWITCH SIGNAL CIRCUITS (AUDIO), SIGNAL CIRCUITS (HANDS-FREE), AND GROUND 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.
20		No	Repair or replace the malfunctioning location and perform the repair completion verification.
21	INSPECT CLOCK SPRING FOR MALFUNCTION • Inspect the applicable part. (Refer to the [CLOCK SPRING INSPECTION] in the workshop manual) • Is the part normal?	Yes	Go to the next step.
21		No	Repair or replace the malfunctioning location and perform the repair completion verification. (Refer to the [CLOCK SPRING REMOVAL/INSTALLATION] in the workshop manual)
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 connectivity master unit (CMU), then go to the next step. (Refer to the [CONNECTIVITY MASTER UNIT (CMU) 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.