DTC B1087:87 [CONNECTIVITY MASTER UNIT]

id0902n7103100

Description

Communication error with commander switch

Detection condition

•  The connectivity master unit (CMU) cannot receive a LIN signal from the commander switch for 5 s or more with the ignition switched ACC or ON (engine off or on).

Fail-safe function

Not applicable

Possible cause

•  Commander switch connector or terminal malfunction

•  Connectivity master unit (CMU) connector or terminal malfunction

•  Short to ground in wiring harness between connectivity master unit (CMU) terminal 2K and commander switch terminal E

•  Short to power supply in wiring harness between connectivity master unit (CMU) terminal 2K and commander switch terminal E

•  Open circuit in wiring harness between connectivity master unit (CMU) terminal 2K and commander switch terminal E

•  Commander switch malfunction

•  Connectivity master unit (CMU) malfunction

Description	Communication error with commander switch
Detection condition	• The connectivity master unit (CMU) cannot receive a LIN signal from the commander switch for 5 s or more with the ignition switched ACC or ON (engine off or on).
Fail-safe function	Not applicable
Possible cause	• Commander switch connector or terminal malfunction • Connectivity master unit (CMU) connector or terminal malfunction • Short to ground in wiring harness between connectivity master unit (CMU) terminal 2K and commander switch terminal E • Short to power supply in wiring harness between connectivity master unit (CMU) terminal 2K and commander switch terminal E • Open circuit in wiring harness between connectivity master unit (CMU) terminal 2K and commander switch terminal E • Commander switch malfunction • Connectivity master unit (CMU) malfunction

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT COMMANDER SWITCH CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Disconnect the commander switch 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 CONNECTIVITY MASTER UNIT (CMU) CONNECTOR CONDITION • Disconnect the connectivity master unit (CMU) 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 COMMANDER SWITCH CIRCUIT FOR SHORT TO GROUND • Verify that the commander switch and connectivity master unit (CMU) connectors are disconnected. • Inspect for continuity between commander switch terminal E (wiring harness-side) and body ground. • Is there continuity?	Yes	Refer to the wiring diagram and verify if there is a common connector between connectivity master unit (CMU) terminal 2K and commander switch terminal E. If there is a common connector: • Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location. • Repair or replace the malfunctioning location. If there is no common connector: • Repair or replace the wiring harness which is shorted to ground. Go to Step 7.
3		No	Go to the next step.
4	INSPECT COMMANDER SWITCH CIRCUIT FOR SHORT TO POWER SUPPLY • Verify that the commander switch and connectivity master unit (CMU) connectors are disconnected. • Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Switch the ignition ON (engine off or on). • Measure the voltage at commander switch terminal E (wiring harness-side). • Is the voltage 0 V?	Yes	Go to the next step.
4		No	Refer to the wiring diagram and verify if there is a common connector between connectivity master unit (CMU) terminal 2K and commander switch terminal E. If there is a common connector: • Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to power supply to determine the malfunctioning location. • Repair or replace the malfunctioning location. If there is no common connector: • Repair or replace the wiring harness which is shorted to power supply. Go to Step 7.
5	INSPECT COMMANDER SWITCH CIRCUIT FOR OPEN CIRCUIT • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Verify that the commander switch and connectivity master unit (CMU) connectors are disconnected. • Inspect the wiring harness for continuity between connectivity master unit (CMU) terminal 2K (wiring harness-side) and commander switch terminal E (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
5		No	Refer to the wiring diagram and verify if there is a common connector between connectivity master unit (CMU) terminal 2K and commander switch terminal E. If there is a common connector: • Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location. • Repair or replace the malfunctioning location. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 7.
6	PERFORM DTC INSPECTION AND VERIFY IF MALFUNCTIONING LOCATION IS COMMANDER SWITCH • Always reconnect all disconnected connectors. • Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Clear the DTC for the connectivity master unit (CMU) using the M-MDS. (See CLEARING DTC [CONNECTIVITY MASTER UNIT].) • Switch the ignition ON (engine off or on) and wait for 12 s or more. • Perform the DTC inspection for the connectivity master unit (CMU) using the M-MDS. (See DTC INSPECTION [CONNECTIVITY MASTER UNIT].) • Is the same DTC displayed?	Yes	Replace the commander switch, then go to the next step. (See COMMANDER SWITCH REMOVAL/INSTALLATION.)
6		No	Go to Step 8.
7	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Always reconnect all disconnected connectors. • Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Clear the DTC for the connectivity master unit (CMU) using the M-MDS. (See CLEARING DTC [CONNECTIVITY MASTER UNIT].) • Switch the ignition ON (engine off or on) and wait for 12 s or more. • Perform the DTC inspection for the connectivity master unit (CMU) using the M-MDS. (See DTC INSPECTION [CONNECTIVITY MASTER UNIT].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the connectivity master unit (CMU). (See CONNECTIVITY MASTER UNIT (CMU) 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 the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [CONNECTIVITY MASTER UNIT].)
8		No	DTC troubleshooting completed.