B1273

MULTIPLEX COMMUNICATION: LIN COMMUNICATION SYSTEM: B1273: Sliding Roof ECU Communication Stop

DTC B1273 - Sliding Roof ECU Communication Stop

DESCRIPTION

This DTC is output when LIN communication between the sliding roof ECU (sliding roof drive gear) and main body ECU (instrument panel junction block assembly) stops for more than 10 seconds.

WIRING DIAGRAM

INSPECTION PROCEDURE
NOTE: When using Techstream with the engine switch off to troubleshoot:

Connect Techstream to the vehicle, and turn the courtesy switch on and off at 1.5-second intervals until communication between the tester and vehicle begins.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SLIDING ROOF ECU)

(a) Disconnect the D9 connector.
(b) Disconnect the Q12 connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:

(d) Measure the voltage according to the value(s) in the table below.
Standard voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. CHECK SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)

(a) Disconnect the Q12 connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)
(a) Replace the sliding roof ECU (sliding roof drive gear sub-assembly) with a normally-functioning or a new one Removal.
(b) Delete the DTC.
NEXT -- Continue to next step.
4. CHECK FOR DTC
(a) Recheck for DTC.
Result:

B -- REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
A -- END