Normal Operation

The smart junction box (SJB) monitors circuits (GY/Y) and (V/GY) for a ground signal. If the door lock control switch connects circuit (GY/Y) to ground circuit (B/Y) or circuit (B/L) the doors lock. If the door lock control switch connects circuit (V/GY) to the ground circuit (B/Y) or circuit (B/L) the doors unlock.

DTC B1309 - (Power Door Lock Circuit Short To Ground) - is an on demand DTC that sets when the SJB senses a short to ground on circuit (GY/Y). DTC B1341 - (Power Door Unlock Circuit Short To Ground) - is an on demand DTC that sets when the SJB senses a short to ground on circuit (V/GY).

This pinpoint test is intended to diagnose the following: 

• Wiring, terminals or connectors
• Door lock control switch(es)
• Passenger door lock control switch
• SJB
  CAUTION:

  • Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

PINPOINT TEST 1		ALL DOOR LOCKS ARE INOPERATIVE FROM ONE SWITCH
STEP	INSPECTION		ACTION
1	CHECK THE RECORDED SJB DTCs FROM ON-DEMAND SELF-TEST Check the recorded results from the SJB self-test. Are DTCs B1309 or B1341 present?	Yes	Go to next step.
		No	Go to step 5.
2	CHECK THE DRIVER DOOR LOCK CONTROL SWITCH Disconnect: Driver Door Lock Control Switch connector 0914-101. Repeat the SJB on-demand self-test. Are DTCs B1309 or B1341 retrieved again?	Yes	Leave the switch disconnected. Go to next step.
		No	INSTALL a new driver door lock control switch. TEST the system for normal operation.
3	CHECK THE PASSENGER DOOR LOCK CONTROL SWITCH Disconnect: Passenger Door Lock Control Switch connector 0914-104. Repeat the SJB on-demand self-test. Are DTCs B1309 or B1341 retrieved again?	Yes	Leave the switch disconnected. Go to next step.
		No	INSTALL a new passenger door lock control switch. TEST the system for normal operation.
4	CHECK CIRCUIT (GY/Y) OR CIRCUIT (V/GY) FOR A SHORT TO GROUND Key in OFF position. Disconnect: SJB J-2280c. For DTC B1309, measure the resistance between the SJB J-2280c circuit (GY/Y) pin 5, harness side and ground; and between the SJB J-2280c circuit (GY/Y) pin 10, harness side and ground. For DTC B1341, measure the resistance between the SJB J-2280c circuit (V/GY) pin 9, harness side and ground; and between the SJB J-2280C circuit (V/GY) pin 14, harness side and ground. Are the resistances greater than 10,000 ohms?	Yes	Go to step 8.
		No	REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
5	CHECK THE SUSPECT DOOR LOCK CONTROL SWITCH FOR CORRECT OPERATION Key in OFF position. Disconnect: Door Lock control Switch connector 0914-101 0914-104. Carry out the door lock control switch component test. 09-14 DRIVER DOOR POWER DOOR LOCK SWITCH INSPECTION, page 09-14-7, or 09-14 PASSENGER POWER DOOR LOCK SWITCH INSPECTION, page 09-14-8.	Yes	Go to next step.
		No	INSTALL a new door lock control switch. TEST the system for normal operation.
6	CHECK CIRCUIT (B/L) OR CIRCUIT (B/Y) FOR AN OPEN Measure the resistance between the driver door lock control switch connector 0914-101 pin 4, circuit (B/L), harness side and ground; or between the passenger door lock control switch connector 0914-104 pin 4, circuit (B/Y), harness side and ground. Is the resistance less than 5 ohms?	Yes	Go to next step.
		No	REPAIR the circuit in question. TEST the system for normal operation.
7	CHECK CIRCUITS (GY/Y) AND (V/GY) FOR AN OPEN Disconnect: SJB J-2280c. Measure the resistance between the suspect door lock control switch, harness side and the SJB, harness side as follows: Courtesy of MAZDA MOTORS CORP. Are the resistances less than 5 ohms?	Yes	Go to next step.
		No	REPAIR the circuit in question. TEST the system for normal operation.
8	CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: corrosion damaged pins pushed-out pins Connect all the SJB connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present?	Yes	INSTALL a new SJB. See SMART JUNCTION BOX (SJB) . TEST the system for normal operation.
		No	The system is operating correctly at this time. The concern may have been cause by a loose or corroded connector.