DTC B10C9:1F [START STOP UNIT] - MAZDA CX-9 TC 2016

DTC B10C9:1F [START STOP UNIT]

id0902p6026300

With Keyless Entry System

Description	Keyless antenna (interior, center) circuit malfunction
Detection condition	• Start stop unit detects an open circuit or short to ground in the keyless antenna (interior, center) with the ignition switched off.
Fail-safe	Not applicable
Possible cause	• Keyless antenna (interior, center) connector or terminal malfunction • Start stop unit connector or terminal malfunction • Short to ground in wiring harness between the following terminals: ? Start stop unit terminal 2I—Keyless antenna (interior, center) terminal B ? Start stop unit terminal 2K—Keyless antenna (interior, center) terminal A • Open circuit in wiring harness between the following terminals: ? Start stop unit terminal 2I—Keyless antenna (interior, center) terminal B ? Start stop unit terminal 2K—Keyless antenna (interior, center) terminal A • Keyless antenna (interior, center) malfunction • Start stop unit malfunction

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT KEYLESS ANTENNA (INTERIOR, CENTER) CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Disconnect the keyless antenna (interior, center) 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 6.
2	INSPECT START STOP UNIT CONNECTOR CONDITION • Disconnect the start stop unit 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 6.
3	INSPECT KEYLESS ANTENNA (INTERIOR, CENTER) CIRCUIT FOR SHORT TO GROUND • Verify that the start stop unit and keyless antenna (interior, center) connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ? Keyless antenna (interior, center) terminal B ? Keyless antenna (interior, center) 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: • Start stop unit terminal 2I—Keyless antenna (interior, center) terminal B • Start stop unit terminal 2K—Keyless antenna (interior, center) 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 KEYLESS ANTENNA (INTERIOR, CENTER) CIRCUIT FOR OPEN CIRCUIT • Verify that the start stop unit and keyless antenna (interior, center) connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): ? Start stop unit terminal 2I—Keyless antenna (interior, center) terminal B ? Start stop unit terminal 2K—Keyless antenna (interior, center) 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: • Start stop unit terminal 2I—Keyless antenna (interior, center) terminal B • Start stop unit terminal 2K—Keyless antenna (interior, center) 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	VERIFY IF MALFUNCTIONING LOCATION IS KEYLESS ANTENNA (INTERIOR, CENTER) DEPENDING ON REPEATABILITY • Always reconnect all disconnected connectors. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Clear the DTC for the start stop unit using the M-MDS. (See CLEARING DTC [START STOP UNIT].) • Perform the following work: ? Switch the ignition off. ? Open the front door (driver's side). ? Close all the doors and liftgate. • Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) • Is the same DTC displayed?	Yes	Replace the keyless antenna (interior, center), then go to the next step. (See KEYLESS ANTENNA REMOVAL/INSTALLATION.)
5		No	Go to Step 7.
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 start stop unit using the M-MDS. (See CLEARING DTC [START STOP UNIT].) • Perform the following work: ? Switch the ignition off. ? Open the front door (driver's side). ? Close all the doors and liftgate. • Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the start stop unit. (See START STOP UNIT 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 [START STOP UNIT].)
7		No	DTC troubleshooting completed.

With Advanced Keyless Entry System

Description	Keyless antenna (interior, front) circuit malfunction
Detection condition	• Start stop unit detects an open circuit or short to ground in the keyless antenna (interior, front) circuit with the ignition switched off.
Fail-safe	• Inhibits the door lock/unlock control using the advanced keyless entry system.
Possible cause	• Keyless antenna (interior, front) connector or terminal malfunction • LF control unit connector or terminal malfunction • Short to ground in wiring harness between the following terminals: ? LF control unit terminal K—Keyless antenna (interior, front) terminal B ? LF control unit terminal M—Keyless antenna (interior, front) terminal A • Open circuit in wiring harness between the following terminals: ? LF control unit terminal K—Keyless antenna (interior, front) terminal B ? LF control unit terminal M—Keyless antenna (interior, front) terminal A • LF control unit malfunction • Keyless antenna (interior, front) malfunction • Start stop unit malfunction

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT KEYLESS ANTENNA (INTERIOR, FRONT) CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Disconnect the keyless antenna (interior, front) 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 LF CONTROL UNIT CONNECTOR CONDITION • Disconnect the LF control unit 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 KEYLESS ANTENNA (INTERIOR, FRONT) CIRCUIT FOR SHORT TO GROUND • Verify that the LF control unit and keyless antenna (interior, front) connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ? Keyless antenna (interior, front) terminal B ? Keyless antenna (interior, front) 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: • LF control unit terminal K—Keyless antenna (interior, front) terminal B • LF control unit terminal M—Keyless antenna (interior, front) 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 7.
3		No	Go to the next step.
4	INSPECT KEYLESS ANTENNA (INTERIOR, FRONT) CIRCUIT FOR OPEN CIRCUIT • Verify that the LF control unit and keyless antenna (interior, front) connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): ? LF control unit terminal K—Keyless antenna (interior, front) terminal B ? LF control unit terminal M—Keyless antenna (interior, front) 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: • LF control unit terminal K—Keyless antenna (interior, front) terminal B • LF control unit terminal M—Keyless antenna (interior, front) 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 7.
5	INSPECT LF CONTROL UNIT • Inspect the LF control unit. (See LF CONTROL UNIT INSPECTION.) • Is the LF control unit normal?	Yes	Go to the next step.
5		No	Replace the LF control unit, then go to Step 7. (See LF CONTROL UNIT REMOVAL/INSTALLATION.)
6	VERIFY IF MALFUNCTIONING LOCATION IS KEYLESS ANTENNA (INTERIOR, FRONT) DEPENDING ON REPEATABILITY • Always reconnect all disconnected connectors. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Clear the DTC for the start stop unit using the M-MDS. (See CLEARING DTC [START STOP UNIT].) • Perform the following work: ? Switch the ignition off. ? Open the front door (driver's side). ? Close all the doors and liftgate. • Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) • Is the same DTC displayed?	Yes	Replace the keyless antenna (interior, front), then go to the next step. (See KEYLESS ANTENNA REMOVAL/INSTALLATION.)
6		No	Go to Step 8.
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 start stop unit using the M-MDS. (See CLEARING DTC [START STOP UNIT].) • Perform the following work: ? Switch the ignition off. ? Open the front door (driver's side). ? Close all the doors and liftgate. • Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the start stop unit. (See START STOP UNIT 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 [START STOP UNIT].)
8		No	DTC troubleshooting completed.