DTC B1201:15 [CONNECTIVITY MASTER UNIT]

id0902n7104600

Description	Steering switch circuit malfunction
Detection condition	• The connectivity master unit (CMU) detected an open circuit or a short to the power supply in the steering switch circuit for 5 s or more with the ignition switched ON (engine off or on).
Fail-safe	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?Clock spring terminal 1B ? Connectivity master unit (CMU) terminal 1N?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 terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • 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. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • 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: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. • Repair or replace the malfunctioning location. If there is no common connector: • Repair or replace the wiring harness which has a short to power supply. Go to Step 7.
5	INSPECT STEERING SWITCH CIRCUIT FOR OPEN CIRCUIT • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • 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?Clock spring terminal 1B ? Connectivity master unit (CMU) terminal 1N?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?Clock spring terminal 1B • Connectivity master unit (CMU) terminal 1N?Clock spring terminal 1E If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • 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. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • 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. • Retrieve the connectivity master unit (CMU) DTCs 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 or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [CONNECTIVITY MASTER UNIT].)
8		No	DTC troubleshooting completed.