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

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DTC B1A89:42 [CONNECTIVITY MASTER UNIT]

Description	Tuner and amp unit (TAU) internal malfunction
Detection condition	The connectivity master unit (CMU) detects an XM module malfunction in the tuner and amp unit (TAU) with the ignition switched ON (engine off or on).
Fail-safe	Not applicable
Possible cause	Tuner and amp unit (TAU) malfunction XM module malfunction
System wiring diagram	Not applicable

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY IF MALFUNCTIONING LOCATION IS TUNER AND AMP UNIT (TAU) DEPENDING ON REPEATABILITY 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 7 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	Replace the tuner and amp unit (TAU), then go to the next step. (See TUNER AND AMP UNIT (TAU) REMOVAL/INSTALLATION.)
		No	Go to the next step.
2	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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