B1213 Multiplex tilt and telescopic ECU communication stops

DESCRIPTION

1. This DTC is detected when communication between the multiplex tilt and telescopic ECU and the multiplex network gateway ECU stops for more than 10 seconds.
   

DTC No.	DTC Detection Condition	Trouble Area
B1213	Multiplex tilt and telescopic ECU communication stops	Multiplex tilt and telescopic ECU Wire harness

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

When "+B of GND short malfunction of communication bus" DTCs (B1214 and B1215) are detected at the same time as "communication stop" DTC B1213, repair the "+B or GND short malfunction of communication bus" DTCs first.

1. INSPECT FUSE (ECU-B No.1)

1. Remove the ECU-B No.1 fuse from the fusible link block.

2. Measure the resistance of the fuse.

   Standard resistance:

   Below 1 Ω
   

NG	REPLACE FUSE

OK

2. CHECK WIRE HARNESS (MULTIPLEX TILT AND TELESCOPIC ECU - BATTERY AND BODY GROUND)

1. Disconnect the T4 ECU connector.

2. Measure the voltage of the wire harness side connector.

   Standard voltage:

   Tester Connection	Specified Condition
   T4-2 (+B) - Body ground	10 to 14 V

3. Measure the resistance of the wire harness side connector.

   Standard resistance:

   Tester Connection	Specified Condition
   T4-11 (GND) - Body ground	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3. CHECK RESISTANCE OF COMMUNICATION LINE

1. Disconnect the P19 and G1 ECU connectors.
   

2. Measure the resistance of the wire harness side connectors.

   Standard resistance:

   Tester Connection	Specified Condition
   T4-5 (MPX1) - P19-7 (MPX1)	Below 1 Ω
   T4-14 (MPX2) - G1-12 (MPD2)	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE MULTIPLEX TILT AND TELESCOPIC ECU