Diagnostic Procedure

WARNING: This page is about a different car, the 2020 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

DTC B1DA1:14 (RETRACTABLE HARDTOP CONTROL MODULE) DIAGNOSTIC PROCEDURE

Step	Inspection		Action
1	VERIFY OTHER RETRACTABLE HARDTOP CONTROL MODULE DTCs Clear the DTC for the retractable hardtop control module using the M-MDS. (See CLEARING DTC [RETRACTABLE HARDTOP CONTROL MODULE] .) Retrieve the retractable hardtop control module DTCs using the M-MDS. (See DTC INSPECTION [RETRACTABLE HARDTOP CONTROL MODULE] .) Is the DTCs U3000:44/U3000:45/U3000:49 displayed?	Yes	Replace the retractable hardtop control module, then go to Step 6. (See RETRACTABLE HARDTOP CONTROL MODULE REMOVAL/INSTALLATION .)
1		No	Go to the next step.
2	VERIFY RETRACTABLE HARDTOP CONTROL MODULE POWER SUPPLY VOLTAGE Measure the voltage at the following terminal (wiring harness-side): Retractable hardtop control module terminal 1B Is the voltage B+?	Yes	Go to the next step.
2		No	Inspect the CABIN+B 50 A fuse, RHT L 30 A fuse. Any fuse is blown: Refer to the wiring diagram and verify whether or not there is a common connector between the following: Retractable hardtop control module terminal 1B and battery positive terminal 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 ground. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to ground. Replace the fuse. Any fuse is damaged: Replace the fuse. All fuses are normal: Refer to the wiring diagram and verify whether or not there is a common connector between the following: Retractable hardtop control module terminal 1B and battery positive terminal 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 6.
3	INSPECT TOP LOCK MOTOR CIRCUIT FOR SHORT TO GROUND Switch the ignition off. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Disconnect the retractable hardtop control module and top lock motor connectors. Inspect for continuity between the following terminals (wiring harness-side) and body ground: Top lock motor terminal E Top lock motor terminal A Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: Retractable hardtop control module terminal 2B and top lock motor terminal E Retractable hardtop control module terminal 2F and top lock motor terminal A 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 ground. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to ground. Go to Step 6.
3		No	Go to the next step.
4	INSPECT TOP LOCK MOTOR CIRCUIT FOR OPEN CIRCUIT Verify that the retractable hardtop control module and top lock motor connectors are disconnected. Inspect the wiring harness for continuity between the following terminals (wiring harness-side): Retractable hardtop control module terminal 2B and top lock motor terminal E Retractable hardtop control module terminal 2F and top lock motor terminal A Is there continuity?	Yes	Go to the next step.
4		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: Retractable hardtop control module terminal 2B and top lock motor terminal E Retractable hardtop control module terminal 2F and top lock motor terminal A 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 6.
5	INSPECT TOP LOCK MOTOR Inspect the top lock motor. (See TOP LOCK MOTOR INSPECTION .) Is the top lock motor normal?	Yes	Go to the next step.
5		No	Replace the top lock motor, then go to the next step. (See TOP LOCK MOTOR REMOVAL/INSTALLATION .)
6	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 retractable hardtop control module using the M-MDS. (See CLEARING DTC [RETRACTABLE HARDTOP CONTROL MODULE] .) Retrieve the retractable hardtop control module DTCs using the M-MDS. (See DTC INSPECTION [RETRACTABLE HARDTOP CONTROL MODULE] .) Is the same Pending DTC present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the retractable hardtop control module. (See RETRACTABLE HARDTOP CONTROL MODULE REMOVAL/INSTALLATION .) Go to the next step.
6		No	Go to the next step.
7	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 [RETRACTABLE HARDTOP CONTROL MODULE] .)
7		No	DTC troubleshooting completed.