B2540

CONVERTIBLE: RETRACTABLE HARDTOP SYSTEM: B2540: Abnormal Difference Between RH and LH Roof Drive Motor Pulse

DTC B2540 - Abnormal Difference Between RH and LH Roof Drive Motor Pulse

DESCRIPTION

The pulse signal is created by the rotation of the roof drive motor.
The signal is used to control the luggage roof operation.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (ROOF DRIVE MOTOR RH, LH PULSE)
(a) Check the Data List for proper functioning of the sliding roof drive gear RH and LH.

Retractable Hardtop





OK:
Value between 12288 to 20480 appears on the screen.
OK -- REPLACE SLIDING ROOF CONTROL ECU
NG -- Continue to next step.
2. CHECK WIRE HARNESS (ECU - SLIDING ROOF DRIVE GEAR RH)




(a) Disconnect the S18 ECU connector.
(b) Disconnect the R17 motor connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
3. INSPECT SLIDING ROOF DRIVE GEAR ASSEMBLY RH (PULSE CIRCUIT OPERATION)




(a) Remove the sliding roof drive gear RH Removal.
(b) Connect the electrical tester's positive (+) lead to terminal 5 and negative (-) lead to terminal 4.
(c) Connect 5 1.5 V dry cell batteries in series.
(d) Connect terminal 6 to the dry cell batteries' positive (+) terminal, and terminal 4 to the dry cell batteries' negative (-) terminal.
(e) Connect the battery's positive (+) lead to terminal 1, and negative (-) lead to terminal 3.
(f) Check the output voltage of terminals 4 and 5.
OK:
Pulse is generated while motor running (refer to the graph)
(g) Reverse the polarity of terminals 1 and 3.




(h) Check the output voltage of terminals 4 and 5.
OK:
Pulse is generated while motor running (refer to the graph)
NG -- REPLACE SLIDING ROOF DRIVE GEAR ASSEMBLY RH
OK -- Continue to next step.
4. CHECK WIRE HARNESS (ECU - SLIDING ROOF DRIVE GEAR LH)




(a) Disconnect the S17 ECU connector.
(b) Disconnect the R16 gear connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
5. INSPECT SLIDING ROOF DRIVE GEAR ASSEMBLY LH (PULSE CIRCUIT OPERATION)




(a) Remove the sliding roof drive motor LH Removal.
(b) Connect the electrical tester's positive (+) lead to terminal 5 and negative (-) lead to terminal 4.
(c) Connect 5 1.5 V dry cell batteries in series.
(d) Connect terminal 6 to the dry cell batteries' positive (+) terminal, and terminal 4 to the dry cell batteries' negative (-) terminal.
(e) Connect the battery's positive (+) lead to terminal 1, and negative (-) lead to terminal 3.
(f) Check the output voltage of terminals 4 and 5.
OK:
Pulse is generated while motor is running (refer to the graph)
(g) Reverse the polarity of terminals 1 and 3.




(h) Check the output voltage of terminals 4 and 5.
OK:
Pulse is generated while motor is running (refer to the graph)
NG -- REPLACE SLIDING ROOF DRIVE GEAR ASSEMBLY LH
OK -- REPLACE SLIDING ROOF CONTROL ECU