DTC B1201:15 [CONNECTIVITY MASTER UNIT]

id0902n7104600

Description

Steering switch circuit malfunction

Detection condition

•  The connectivity master unit (CMU) detected an open circuit in the steering switch circuit or a short to the power supply for 5 s or more with the ignition switched ON (engine off or on).

Fail-safe function

Not applicable

Possible cause

•  Clock spring connector or terminal malfunction

•  Connectivity master unit (CMU) connector or terminal malfunction

•  Clock spring malfunction

•  Short to power supply in wiring harness between connectivity master unit (CMU) terminal 1O and clock spring terminal 1B

•  Open circuit in wiring harness between the following terminals:

―  Connectivity master unit (CMU) terminal 1O and clock spring terminal 1B

―  Connectivity master unit (CMU) terminal 1N and clock spring terminal 1E

•  Steering switch malfunction

•  Connectivity master unit (CMU) malfunction

Description	Steering switch circuit malfunction
Detection condition	• The connectivity master unit (CMU) detected an open circuit in the steering switch circuit or a short to the power supply for 5 s or more with the ignition switched ON (engine off or on).
Fail-safe function	Not applicable
Possible cause	• Clock spring connector or terminal malfunction • Connectivity master unit (CMU) connector or terminal malfunction • Clock spring malfunction • Short to power supply in wiring harness between connectivity master unit (CMU) terminal 1O and clock spring terminal 1B • Open circuit in wiring harness between the following terminals: ― Connectivity master unit (CMU) terminal 1O and clock spring terminal 1B ― Connectivity master unit (CMU) terminal 1N and clock spring terminal 1E • Steering switch malfunction • Connectivity master unit (CMU) malfunction

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT CLOCK SPRING CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Disconnect the clock spring connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
1		No	Repair or replace the connector, then go to Step 7.
2	INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR CONDITION • Disconnect the connectivity master unit (CMU) connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
2		No	Repair or replace the connector, then go to Step 7.
3	INSPECT CLOCK SPRING • Inspect the clock spring. (See CLOCK SPRING INSPECTION.) • Is the clock spring normal?	Yes	Go to the next step.
3		No	Replace the clock spring, then go to Step 7. (See CLOCK SPRING REMOVAL/INSTALLATION.)
4	INSPECT STEERING SWITCH CIRCUIT FOR SHORT TO POWER SUPPLY • Verify that the clock spring and connectivity master unit (CMU) connectors are disconnected. • Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Switch the ignition ON (engine off or on). • Measure the voltage at clock spring terminal 1B (wiring harness-side). • Is the voltage 0 V?	Yes	Go to the next step.
4		No	Refer to the wiring diagram and verify if there is a common connector between connectivity master unit (CMU) terminal 1O and clock spring terminal 1B. If there is a common connector: • Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to power supply to determine the malfunctioning location. • Repair or replace the malfunctioning location. If there is no common connector: • Repair or replace the wiring harness which is shorted to the power supply. Go to Step 7.
5	INSPECT STEERING SWITCH CIRCUIT FOR OPEN CIRCUIT • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Verify that the clock spring and connectivity master unit (CMU) connectors are disconnected. • Inspect the wiring harness for continuity between the following terminals (wiring harness-side). ― Connectivity master unit (CMU) terminal 1O and clock spring terminal 1B ― Connectivity master unit (CMU) terminal 1N and clock spring terminal 1E • Is there continuity?	Yes	Go to the next step.
5		No	Refer to the wiring diagram and verify if there is a common connector between the following terminals. • Connectivity master unit (CMU) terminal 1O and clock spring terminal 1B • Connectivity master unit (CMU) terminal 1N and clock spring terminal 1E If there is a common connector: • Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location. • Repair or replace the malfunctioning location. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 7.
6	INSPECT STEERING SWITCH • Inspect the steering switch. (See STEERING SWITCH INSPECTION.) • Is the steering switch normal?	Yes	Go to the next step.
6		No	Replace the steering switch, then go to the next step. (See STEERING SWITCH REMOVAL/INSTALLATION.)
7	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Always reconnect all disconnected connectors. • Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Clear the DTC for the connectivity master unit (CMU) using the M-MDS. (See CLEARING DTC [CONNECTIVITY MASTER UNIT].) • Switch the ignition ON (engine off or on) and wait for 12 s or more. • Perform the DTC inspection for the connectivity master unit (CMU) using the M-MDS. (See DTC INSPECTION [CONNECTIVITY MASTER UNIT].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the connectivity master unit (CMU). (See CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION.) Go to the next step.
7		No	Go to the next step.
8	VERIFY IF OTHER DTCs DISPLAYED • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [CONNECTIVITY MASTER UNIT].)
8		No	DTC troubleshooting completed.