Diagnosis Procedure
1.CHECK FUSE
Check that the following fuse is not fusing.
Is the fuse fusing? YES >> Replace the fuse after repairing the applicable circuit.
NO >> GO TO 2.
2.CHECK GROUND CONNECTION
Is the inspection result normal? YES >> GO TO 3.
NO >> Repair or replace ground connection.
3.CHECK ECM GROUND CIRCUIT
Is the inspection result normal? YES >> GO TO 4.
NO >> Repair or replace error-detected parts.
4.CHECK ECM POWER SUPPLY (MAIN)-1
Is the inspection result normal? YES >> GO TO 5.
NO >> GO TO 6.
5.CHECK ECM POWER SUPPLY (MAIN)--2
Is the inspection result normal? YES >> GO TO 9.
NO >> GO TO 7.
6.CHECK ECM POWER SUPPLY (MAIN) CIRCUIT
Is the inspection result normal? YES >> Perform the trouble diagnosis for power supply circuit.
NO >> Repair or replace error-detected parts.
7.CHECK ECM RELAY CONTROL SIGNAL
Check the voltage between ECM harness connector terminals as per the following.
Is the inspection result normal? YES >> Check Intermittent Incident. Refer to GI-41, "Intermittent Incident".
NO >> GO TO 8.
8.CHECK ECM RELAY CONTROL SIGNAL CIRCUIT
Is the inspection result normal? YES >> Replace IPDM E/R. Refer to PCS-35, "Removal and Installation".
NO >> Repair or replace error-detected parts.
9.CHECK IGNITION SWITCH SIGNAL
Is the inspection result normal? YES >> GO TO 11.
NO >> GO TO 10.
10.CHECK IGNITION SWITCH SIGNAL CIRCUIT
Is the inspection result normal? YES >> Perform the trouble diagnosis for power supply circuit.
NO >> Repair or replace error-detected parts.
11.CHECK ECM POWER SUPPLY (BACK-UP)
Check the voltage between ECM harness connector terminals.
Is the inspection result normal? YES >> Check Intermittent Incident. Refer to GI-41, "Intermittent Incident".
NO >> GO TO 12.
12.CHECK ECM POWER SUPPLY (BACK-UP) CIRCUIT
Is the inspection result normal? YES >> Perform the trouble diagnosis for power supply circuit.
NO >> Repair or replace error-detected parts.
Bluetooth connection
Functional requirements
Compatible device with Bluetooth interface.
Compatible devices.
The vehicle key or BMW display key is in the
vehicle.
The device is ready for operation.
Bluetooth is switched on in the vehicle and
on the device.
The pairing readiness is displayed on the
Control Disp ...
Connecting procedure
NOTE:
The connecting procedure must be performed
when the vehicle is stationary. If the
vehicle starts moving during the procedure,
the procedure will be cancelled.
To connect a phone to the Bluetooth® Hands-
Free Phone System:
Press the SETTING button.
Use the TUNE/FOLDER or TUNE ...
U1040 ENG comm circuit
DTC Description
DTC DETECTION LOGIC
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
U1040
ENG COMM CIRCUIT
(Engine communication circuit)
ECM cannot transmit a communication signal to generator.
POSSIBLE CAUSE
Harne ...