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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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DTC B1201:15 [CONNECTIVITY MASTER UNIT]

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 cable. (See NEGATIVE BATTERY CABLE 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.
		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.
		No	Repair or replace the connector, then go to Step 7.
3	INSPECT CLOCK SPRING Inspect the clock spring. (See CLOCK SPRING INSPECTION [STANDARD DEPLOYMENT CONTROL SYSTEM].) (See CLOCK SPRING INSPECTION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) Is the clock spring normal?	Yes	Go to the next step.
		No	Replace the clock spring, then go to Step 7. (See CLOCK SPRING REMOVAL/INSTALLATION [STANDARD DEPLOYMENT CONTROL SYSTEM].) (See CLOCK SPRING REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)
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 cable. (See NEGATIVE BATTERY CABLE 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.
		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 part. 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 cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Verify that the clock spring and connectivity master unit (CMU) connectors are disconnected. Inspect 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.
		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 part. 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.
		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 cable. (See NEGATIVE BATTERY CABLE 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.
		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].)
		No	DTC troubleshooting completed.

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