Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b2242 uart communication

Subaru Legacy BN/BS (2015-2019) Service Manual / Infotainment system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b2242 uart communication

DTC DETECTING CONDITION:

Regular communication with A/C panel (20 ms) cannot be established for 10 seconds.

TROUBLE SYMPTOM:

• A/C operation cannot be activated using the voice control.

• Time displayed on the A/C panel cannot be corrected.

WIRING DIAGRAM:

Audio system Audio System > WIRING DIAGRAM

Navigation system Navigation System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK A/C SYSTEM. Check the A/C system. Basic Diagnostic Procedure > PROCEDURE	Is there any fault-	Perform the diagnosis according to diagnosis for A/C system.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2242 UART COMMUNICATION
2.CHECK HARNESS (OPEN CIRCUIT). 1) Disconnect the audio (7-inch display) connector or navigation unit connector. 2) Disconnect the A/C panel connector. 3) Using the tester, measure the resistance of harness between audio (7-inch display) connector or navigation unit connector and A/C panel connector. Connector & terminal (i88) No. 11 — (i87) No. 11: (i88) No. 12 — (i87) No. 12:	Is the resistance less than 1 --	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2242 UART COMMUNICATION	Repair the open circuit of harness between audio (7-inch display) connector or navigation unit connector and A/C panel connector.
3.CHECK HARNESS (GROUND SHORT CIRCUIT). Using the tester, measure the resistance between audio (7-inch display) connector or navigation unit connector and chassis ground. Connector & terminal (i87) No. 11 — Chassis ground: (i87) No. 12 — Chassis ground:	Is the resistance 1 M- or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2242 UART COMMUNICATION	Repair the short to ground in harness between audio (7-inch display) connector or navigation unit connector and A/C panel connector.
4.CHECK HARNESS (SHORT CIRCUIT TO POWER SUPPLY). 1) Turn the ignition switch to ON. 2) Using the tester, measure the voltage between audio (7-inch display) connector or navigation unit connector and chassis ground. (With each connector disconnected) Connector & terminal (i87) No. 11 (+) — Chassis ground (−): (i87) No. 12 (+) — Chassis ground (−):	Is the voltage less than 1 V-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2242 UART COMMUNICATION	Repair the short to power supply in harness between audio (7-inch display) connector or navigation unit connector and A/C panel connector.
5.CHECK DTC. 1) Connect all the disconnected connectors. 2) Perform the Clear Memory Mode. Clear Memory Mode 3) Turn the ignition switch to OFF > ON. 4) Read the DTC again. Read Diagnostic Trouble Code (DTC)	Is DTC B2242 displayed- (Current malfunction)	Replace the A/C panel.	Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

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