DTC B257C [BCM]

id0902f5955900

Description

Front door lock-link switch (passenger-side)/rear door lock-link switch (LH)/(RH) circuit malfunction

Detection condition

•  Open circuit in front door lock-link switch (passenger-side), rear door lock-link switch (LH) or (RH) circuit with the door lock-link switches unlocked.

Possible cause

•  Front door latch and lock actuator (passenger-side) connector or terminal malfunction

•  Open circuit in wiring harness between the following:

―  Front door latch and lock actuator (passenger-side) terminal 2E—Body ground (L.H.D.)

―  Front door latch and lock actuator (passenger-side) terminal 2B—Body ground (R.H.D.)

•  Front door lock-link switch (passenger-side) malfunction

•  BCM connector or terminal malfunction

•  Open circuit in wiring harness between the following terminals:

―  Front door latch and lock actuator (passenger-side) terminal 2A—BCM terminal 1E (L.H.D.)

―  Front door latch and lock actuator (passenger-side) terminal 2F—BCM terminal 1E (R.H.D.)

•  Rear door latch and lock actuator (LH) connector or terminal malfunction

•  Open circuit in wiring harness between rear door latch and lock actuator (LH) terminal 2B and body ground

•  Rear door lock-link switch (LH) malfunction

•  Open circuit in wiring harness between rear door latch and lock actuator (LH) terminal 2F and BCM terminal 6U

•  Rear door latch and lock actuator (RH) connector or terminal malfunction

•  Open circuit in wiring harness between rear door latch and lock actuator (RH) terminal 2E and body ground

•  Rear door lock-link switch (RH) malfunction

•  Open circuit in wiring harness between rear door latch and lock actuator (RH) terminal 2A and BCM terminal 6W

•  BCM malfunction

Description	Front door lock-link switch (passenger-side)/rear door lock-link switch (LH)/(RH) circuit malfunction
Detection condition	• Open circuit in front door lock-link switch (passenger-side), rear door lock-link switch (LH) or (RH) circuit with the door lock-link switches unlocked.
Possible cause	• Front door latch and lock actuator (passenger-side) connector or terminal malfunction • Open circuit in wiring harness between the following: ― Front door latch and lock actuator (passenger-side) terminal 2E—Body ground (L.H.D.) ― Front door latch and lock actuator (passenger-side) terminal 2B—Body ground (R.H.D.) • Front door lock-link switch (passenger-side) malfunction • BCM connector or terminal malfunction • Open circuit in wiring harness between the following terminals: ― Front door latch and lock actuator (passenger-side) terminal 2A—BCM terminal 1E (L.H.D.) ― Front door latch and lock actuator (passenger-side) terminal 2F—BCM terminal 1E (R.H.D.) • Rear door latch and lock actuator (LH) connector or terminal malfunction • Open circuit in wiring harness between rear door latch and lock actuator (LH) terminal 2B and body ground • Rear door lock-link switch (LH) malfunction • Open circuit in wiring harness between rear door latch and lock actuator (LH) terminal 2F and BCM terminal 6U • Rear door latch and lock actuator (RH) connector or terminal malfunction • Open circuit in wiring harness between rear door latch and lock actuator (RH) terminal 2E and body ground • Rear door lock-link switch (RH) malfunction • Open circuit in wiring harness between rear door latch and lock actuator (RH) terminal 2A and BCM terminal 6W • BCM malfunction

Diagnostic procedure

Step	Inspection		Action
1	VERIFY IF MALFUNCTION CAUSE IS FRONT DOOR LOCK-LINK SWITCH (PASSENGER-SIDE) CIRCUIT, REAR DOOR LOCK-LINK SWITCH (LH) CIRCUIT, (RH) CIRCUIT OR BCM • Operate the door lock-link switch to lock and unlock. • Do all door lock-link switch operate correctly?	Yes	Go to Step 20.
1		No	Front door lock-link switch (passenger-side) does not operate correctly: • Go to the next step. Rear door lock-link switch (LH) does not operate correctly: • Go to Step 8. Rear door lock-link switch (RH) does not operate correctly: • Go to Step 14. All door lock-link switches do not operate correctly: • Go to Step 20.
2	INSPECT FRONT DOOR LATCH AND LOCK ACTUATOR (PASSENGER-SIDE) CONNECTOR • Turn the ignition switch to the OFF position. • Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Disconnect the front door latch and lock actuator (passenger-side) connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is there any malfunction?	Yes	Repair or replace the connector, then go to Step 20.
2		No	Go to the next step.
3	VERIFY IF MALFUNCTION CAUSE IS FRONT DOOR LOCK-LINK SWITCH (PASSENGER-SIDE) POWER SUPPLY CIRCUIT OR GROUND CIRCUIT • Verify that the front door latch and lock actuator (passenger-side) connector is disconnected. • Reconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Measure the voltage at the following terminal (wiring harness-side): ― Front door latch and lock actuator (passenger-side) terminal 2A (L.H.D.) ― Front door latch and lock actuator (passenger-side) terminal 2F (R.H.D.) • Is the voltage 0 V?	Yes	A malfunction in power supply circuit can be considered. • Go to Step 6.
3		No	A malfunction in ground circuit can be considered. • Go to the next step.
4	INSPECT FOR OPEN CIRCUIT IN FRONT DOOR LOCK-LINK SWITCH (PASSENGER-SIDE) GROUND CIRCUIT • Verify that the front door latch and lock actuator (passenger-side) connector is disconnected. • Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Inspect for continuity between the following terminal (wiring harness-side) and body ground: ― Front door latch and lock actuator (passenger-side) terminal 2E (L.H.D.) ― Front door latch and lock actuator (passenger-side) terminal 2B (R.H.D.) • Is there continuity?	Yes	Go to the next step.
4		No	Repair or replace the wiring harness which has an open circuit, then go to Step 20.
5	INSPECT FRONT DOOR LOCK-LINK SWITCH (PASSENGER-SIDE) • Inspect the front door lock-link switch (passenger-side). (See DOOR LOCK-LINK SWITCH INSPECTION.) • Is there any malfunction?	Yes	Replace the front door latch and lock actuator (passenger-side), then go to Step 20. (See FRONT DOOR LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION.)
5		No	Go to Step 20.
6	INSPECT BCM CONNECTOR • Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Disconnect the BCM connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is there any malfunction?	Yes	Repair or replace the connector, then go to Step 20.
6		No	Go to the next step.
7	VERIFY IF MALFUNCTION CAUSE IS BCM OR FRONT DOOR LOCK-LINK SWITCH (PASSENGER-SIDE) POWER SUPPLY CIRCUIT • Reconnect the BCM connector. • Reconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Measure the voltage at the BCM terminal 1E (wiring harness-side). • Is the voltage 0 V?	Yes	A malfunction in BCM can be considered. • Go to Step 20.
7		No	A malfunction in power supply circuit can be considered. • Repair or replace the wiring harness which has an open circuit, then go to Step 20.
8	INSPECT REAR DOOR LATCH AND LOCK ACTUATOR (LH) CONNECTOR • Turn the ignition switch to the OFF position. • Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Disconnect the rear door latch and lock actuator (LH) connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is there any malfunction?	Yes	Repair or replace the connector, then go to Step 20.
8		No	Go to the next step.
9	VERIFY IF MALFUNCTION CAUSE IS REAR DOOR LOCK-LINK SWITCH (LH) POWER SUPPLY CIRCUIT OR GROUND CIRCUIT • Verify that the rear door latch and lock actuator (LH) connector is disconnected. • Reconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Measure the voltage at the rear door latch and lock actuator (LH) terminal 2F (wiring harness-side). • Is the voltage 0 V?	Yes	A malfunction in power supply circuit can be considered. • Go to Step 12.
9		No	A malfunction in ground circuit can be considered. • Go to the next step.
10	INSPECT FOR OPEN CIRCUIT IN REAR DOOR LOCK-LINK SWITCH (LH) GROUND CIRCUIT • Verify that the rear door latch and lock actuator (LH) connector is disconnected. • Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Inspect for continuity between rear door latch and lock actuator (LH) terminal 2B (wiring harness-side) and body ground. • Is there continuity?	Yes	Go to the next step.
10		No	Repair or replace the wiring harness which has an open circuit, then go to Step 20.
11	INSPECT REAR DOOR LOCK-LINK SWITCH (LH) • Inspect the rear door lock-link switch (LH). (See DOOR LOCK-LINK SWITCH INSPECTION.) • Is there any malfunction?	Yes	Replace the rear door latch and lock actuator (LH), then go to Step 20. (See REAR DOOR LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION.)
11		No	Go to Step 20.
12	INSPECT BCM CONNECTOR • Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Disconnect the BCM connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is there any malfunction?	Yes	Repair or replace the connector, then go to Step 20.
12		No	Go to the next step.
13	VERIFY IF MALFUNCTION CAUSE IS BCM OR REAR DOOR LOCK-LINK SWITCH (LH) POWER SUPPLY CIRCUIT • Reconnect the BCM connector. • Reconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Measure the voltage at the BCM terminal 6U (wiring harness-side). • Is the voltage 0 V?	Yes	A malfunction in BCM can be considered. • Go to Step 20.
13		No	A malfunction in power supply circuit can be considered. • Repair or replace the wiring harness which has an open circuit, then go to Step 20.
14	INSPECT REAR DOOR LATCH AND LOCK ACTUATOR (RH) CONNECTOR • Turn the ignition switch to the OFF position. • Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Disconnect the rear door latch and lock actuator (RH) connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is there any malfunction?	Yes	Repair or replace the connector, then go to Step 20.
14		No	Go to the next step.
15	VERIFY IF MALFUNCTION CAUSE IS REAR DOOR LOCK-LINK SWITCH (RH) POWER SUPPLY CIRCUIT OR GROUND CIRCUIT • Verify that the rear door latch and lock actuator (RH) connector is disconnected. • Reconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Measure the voltage at the rear door latch and lock actuator (RH) terminal 2A (wiring harness-side). • Is the voltage 0 V?	Yes	A malfunction in power supply circuit can be considered. • Go to Step 18.
15		No	A malfunction in ground circuit can be considered. • Go to the next step.
16	INSPECT FOR OPEN CIRCUIT IN REAR DOOR LOCK-LINK SWITCH (RH) GROUND CIRCUIT • Verify that the rear door latch and lock actuator (RH) connector is disconnected. • Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Inspect for continuity between rear door latch and lock actuator (RH) terminal 2E (wiring harness-side) and body ground. • Is there continuity?	Yes	Go to the next step.
16		No	Repair or replace the wiring harness which has an open circuit, then go to Step 20.
17	INSPECT REAR DOOR LOCK-LINK SWITCH (RH) • Inspect the rear door lock-link switch (RH). (See DOOR LOCK-LINK SWITCH INSPECTION.) • Is there any malfunction?	Yes	Replace the rear door latch and lock actuator (RH), then go to Step 20. (See REAR DOOR LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION.)
17		No	Go to Step 20.
18	INSPECT BCM CONNECTOR • Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Disconnect the BCM connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is there any malfunction?	Yes	Repair or replace the connector, then go to Step 20.
18		No	Go to the next step.
19	VERIFY IF MALFUNCTION CAUSE IS BCM OR REAR DOOR LOCK-LINK SWITCH (RH) POWER SUPPLY CIRCUIT • Reconnect the BCM connector. • Reconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Measure the voltage at the BCM terminal 6W (wiring harness-side). • Is the voltage 0 V?	Yes	A malfunction in BCM can be considered. • Go to the next step.
19		No	A malfunction in power supply circuit can be considered. • Repair or replace the wiring harness which has an open circuit, then go to the next step.
20	VERIFY DTC TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Reconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7].) • Clear the DTC for the BCM using the M-MDS. (See CLEARING DTC [BCM].) • Retrieve the BCM DTCs using the M-MDS. (See DTC INSPECTION [BCM].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.) Go to the next step.
20		No	Go to the next step.
21	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 [BCM].)
21		No	DTC troubleshooting completed.