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.

Dtc b2243 sd card communication

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Dtc b2241 can communication

DTC DETECTING CONDITION:Detected when there has been no proper communication in 10 seconds with the driver control of serial communication between CAN microcomputer and main microcomputer.TROUBLE SYMP ...

Other materials:

Disassembly
1. Disconnect the terminal M from the magnet switch assembly.2. Remove the magnet switch assembly from the starter housing assembly.3. Remove screws (A) and bolts (B) of the brush holder assembly, and remove the starter cover assembly.4. Remove the brush holder assembly from the armature assembly.NO ...