ON-BOARD DIAGNOSIS SYSTEM [ADVANCED KEYLESS ENTRY SYSTEM]

id091400111233

Outline

• The on-board diagnostic function consists of the following functions:

― A malfunction detection function, which detects overall malfunctions in the advanced keyless entry system-related parts.

― A memory function, which stores detected DTCs.

― A display function, which indicates malfunction locations and status via DTC output.

― A PID/data monitoring function, which reads out specific input/output signals and verifies the input/output condition.

• Using the Mazda Modular Diagnostic System (M-MDS), DTCs can be read out and deleted, and the PID/data monitoring function can be activated.

Malfunction detection function

• Detects malfunctions in input/output signals.

• If a malfunction occurs, the start stop unit records the malfunction as a DTC. A recorded DTC can be read by the Mazda Modular Diagnostic System (M-MDS).

×: Applicable

—: Not applicable

DTC No.	KEY warning light (red)	Description	Fail-safe function	Drive cycle	Self test type^*1	Memory function
B10C6:1F	On	Keyless antenna (exterior, rear) circuit malfunction	×	—	C, D	×
B10C7:1F	On	Keyless antenna (interior, rear) circuit malfunction	×	—	C, D	×
B10C9:1F	On	Keyless antenna (interior, front) circuit malfunction	×	—	C, D	×
B10D1:23	On	Request switch (LF) circuit malfunction	—	—	C	×
B10D3:23	On	Request switch (RF) circuit malfunction	—	—	C	×
B11C4:23^*2	On	Request switch (liftgate) circuit malfunction	—	—	C	×
B11FD:1F	On	Keyless antenna (exterior, LF) circuit malfunction	×	—	C, D	×
B1210:1F	On	Keyless antenna (exterior, RF) circuit malfunction	×	—	C, D	×
B13C3:04	On	LF control unit internal malfunction	×	—	C	×
B13C3:09	On	LF control unit malfunction	×	—	C	×
B13C3:16	On	LF control unit power supply voltage low input	×	—	C	×
B13C3:29	On	Communication error between start stop unit and LF control unit	×	—	C	×

*1 :C: CMDTC self test, D: ODDTC self test

*2 :5HB

DTC 7-digit code definition

• When related systems or components have failed, the CM stores the DTC of the malfunctioning part in the CM memory, and allows for the retrieval of the store data using scanning tool when necessary. The DTCs are indicated using seven digits. Each digit indicates the following.

ac5uun00001109

Status byte for DTC

• The two digits (two digits after hyphen (-)) after the seven-digit DTC.

ac5wzn00002015

• A code which indicates the pending code, current/past malfunction status, or warning illumination status.

• Can be read by performing a CMDTC self-test using the Mazda Modular Diagnostic System (M-MDS).

• For details on the status byte, refer to the explanation on the Mazda Modular Diagnostic System (M-MDS) when reading the DTC.

Detection condition for the applicable DTC

DTC

System malfunction location

Detection condition

B10C6:1F

Keyless antenna (exterior, rear) circuit malfunction

Start stop unit detects an open circuit or short to ground in the keyless antenna (exterior, rear) circuit with the ignition switched off.

B10C7:1F

Keyless antenna (interior, rear) circuit malfunction

Start stop unit detects an open circuit or short to ground in the keyless antenna (interior, rear) circuit with the ignition switched off.

B10C9:1F

Keyless antenna (interior, front) circuit malfunction

Start stop unit detects an open circuit or short to ground in the keyless antenna (interior, front) circuit with the ignition switched off.

B10D1:23

Request switch (LF) circuit malfunction

•  Start stop unit detected any of the following conditions at a vehicle speed of 5 km/h {3 mph} or more.

―  The request switch (LF) is continuously ON for 2 min or more.

―  The request switch (LF) was ON 7 times before the vehicle speed decreased to less than 5 km/h {3 mph}.

B10D3:23

Request switch (RF) circuit malfunction

•  Start stop unit detected any of the following conditions at a vehicle speed of 5 km/h {3 mph} or more.

―  The request switch (RF) is continuously ON for 2 min or more.

―  The request switch (RF) was ON 7 times before the vehicle speed decreased to less than 5 km/h {3 mph}.

B11C4:23^*1

Request switch (liftgate) circuit malfunction

•  Start stop unit detected any of the following conditions at a vehicle speed of 5 km/h {3 mph} or more.

―  The request switch (liftgate) is continuously ON for 2 min or more.

―  The request switch (liftgate) was ON 7 times before the vehicle speed decreased to less than 5 km/h {3 mph}.

B11FD:1F

Keyless antenna (exterior, LF) circuit malfunction

Start stop unit detects an open circuit or short to ground in the keyless antenna (exterior, LF) circuit with the ignition switched off.

B1210:1F

Keyless antenna (exterior, RF) circuit malfunction

Start stop unit detects an open circuit or short to ground in the keyless antenna (exterior, RF) circuit with the ignition switched off.

B13C3:04

LF control unit internal malfunction

Start stop unit detects the LF control unit internal malfunction.

B13C3:09

LF control unit malfunction

•  Start stop unit detects that the LF state signal of the LF control unit is low for 5 s or more.

•  With the communication between the start stop unit and LF control unit being performed normally, there is no response from the LF control unit even though there is the signal transmission request from the start stop unit to the LF control unit, and the LF state signal becomes low.

B13C3:16

LF control unit power supply voltage low input

Start stop unit power supply circuit voltage of 8.5 V or more or less than 16.5 V and LF control unit power supply circuit voltage of 5 V or more or less than 8.5 V are detected for 5 s or more.

B13C3:29

Communication error between start stop unit and LF control unit

Start stop unit detects the communication error with the LF control unit 10 times.

DTC	System malfunction location	Detection condition
B10C6:1F	Keyless antenna (exterior, rear) circuit malfunction	Start stop unit detects an open circuit or short to ground in the keyless antenna (exterior, rear) circuit with the ignition switched off.
B10C7:1F	Keyless antenna (interior, rear) circuit malfunction	Start stop unit detects an open circuit or short to ground in the keyless antenna (interior, rear) circuit with the ignition switched off.
B10C9:1F	Keyless antenna (interior, front) circuit malfunction	Start stop unit detects an open circuit or short to ground in the keyless antenna (interior, front) circuit with the ignition switched off.
B10D1:23	Request switch (LF) circuit malfunction	• Start stop unit detected any of the following conditions at a vehicle speed of 5 km/h {3 mph} or more. ― The request switch (LF) is continuously ON for 2 min or more. ― The request switch (LF) was ON 7 times before the vehicle speed decreased to less than 5 km/h {3 mph}.
B10D3:23	Request switch (RF) circuit malfunction	• Start stop unit detected any of the following conditions at a vehicle speed of 5 km/h {3 mph} or more. ― The request switch (RF) is continuously ON for 2 min or more. ― The request switch (RF) was ON 7 times before the vehicle speed decreased to less than 5 km/h {3 mph}.
B11C4:23^*1	Request switch (liftgate) circuit malfunction	• Start stop unit detected any of the following conditions at a vehicle speed of 5 km/h {3 mph} or more. ― The request switch (liftgate) is continuously ON for 2 min or more. ― The request switch (liftgate) was ON 7 times before the vehicle speed decreased to less than 5 km/h {3 mph}.
B11FD:1F	Keyless antenna (exterior, LF) circuit malfunction	Start stop unit detects an open circuit or short to ground in the keyless antenna (exterior, LF) circuit with the ignition switched off.
B1210:1F	Keyless antenna (exterior, RF) circuit malfunction	Start stop unit detects an open circuit or short to ground in the keyless antenna (exterior, RF) circuit with the ignition switched off.
B13C3:04	LF control unit internal malfunction	Start stop unit detects the LF control unit internal malfunction.
B13C3:09	LF control unit malfunction	• Start stop unit detects that the LF state signal of the LF control unit is low for 5 s or more. • With the communication between the start stop unit and LF control unit being performed normally, there is no response from the LF control unit even though there is the signal transmission request from the start stop unit to the LF control unit, and the LF state signal becomes low.
B13C3:16	LF control unit power supply voltage low input	Start stop unit power supply circuit voltage of 8.5 V or more or less than 16.5 V and LF control unit power supply circuit voltage of 5 V or more or less than 8.5 V are detected for 5 s or more.
B13C3:29	Communication error between start stop unit and LF control unit	Start stop unit detects the communication error with the LF control unit 10 times.

*1 :5HB

Data monitor function

• With the PID/data monitor function, input/output signal monitor items set in the start stop unit can be selected and read out in real-time.

PID

Unit/Operation

Data contents

Data read/use method

Module control terminal

LG/T_LK_SW^*1

Off/On

Request switch (liftgate) operation condition

•  Off: Request switch (liftgate) is off.

•  On: Request switch (liftgate) is on.

The request switch (liftgate) input is an input signal to the start stop unit through the LF control unit.

2F (LF control unit communication)

RQ_SW_LF

Off/On

Request switch (LF) operation condition

•  Off: Request switch (LF) is off.

•  On: Request switch (LF) is on.

The signal is input to the start stop unit through the LF control unit of the request switch (LF).

2F (LF control unit communication)

RQ_SW_RF

Off/On

Request switch (RF) operation condition

•  Off: Request switch (RF) is off.

•  On: Request switch (RF) is on.

The signal is input to the start stop unit through the LF control unit of the request switch (RF).

2F (LF control unit communication)

PID	Unit/Operation	Data contents	Data read/use method	Module control terminal
LG/T_LK_SW^*1	Off/On	Request switch (liftgate) operation condition • Off: Request switch (liftgate) is off. • On: Request switch (liftgate) is on.	The request switch (liftgate) input is an input signal to the start stop unit through the LF control unit.	2F (LF control unit communication)
RQ_SW_LF	Off/On	Request switch (LF) operation condition • Off: Request switch (LF) is off. • On: Request switch (LF) is on.	The signal is input to the start stop unit through the LF control unit of the request switch (LF).	2F (LF control unit communication)
RQ_SW_RF	Off/On	Request switch (RF) operation condition • Off: Request switch (RF) is off. • On: Request switch (RF) is on.	The signal is input to the start stop unit through the LF control unit of the request switch (RF).	2F (LF control unit communication)

*1 :5HB

Active Command Modes Function

• The active command modes are shown below.

Simulation item

Unit/Operation

Data contents

Data read/use method

Output part name

BZR_OUT

Off/On

•  Off: Keyless beeper does not sound.

•  On: Keyless beeper sounds.

•  When the simulation item BZR_OUT is turned on, a force override signal is sent to the LF control unit from the start stop unit, and the LF control unit drives (sounds) the keyless beeper.

•  With adoption of a separate excitation buzzer to the keyless beeper, buzzer does not sound normally even if the voltage is applied to the buzzer unit because there is no oscillation circuit. The integrity of the keyless beeper is determined using the simulation item BZR_OUT.

•  If the keyless buzzer does not sound even though the simulation function BZR_OUT is on, perform diagnosis using the following procedure.

―  Press the remote transmitter lock/unlock button repeatedly and measure the terminal voltage of the keyless buzzer when the button is pressed.

Voltage is output

•  Keyless buzzer malfunction may have occurred.

Voltage is not output

•  Related wiring harness, or LF control unit malfunction may have occurred.

Keyless beeper