2003 NISSAN TEANA Power

TROUBLE DIAGNOSIS
LAN-73
[CAN]
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3. CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the ECM. Refer to EC-70, "
Circuit Diagram" (QR engine),
EC-413, "
Circuit Diagram" (VQ engine).
OK or NG
OK >>
Present error: Replace the ECM. Refer to EC-47, "Procedure After Replacing ECM" (QR
engine), EC-389, "
Procedure After Replacing ECM" (VQ engine).

Past error: Error was detected in the ECM branch line.
NG >> Repair the power supply and the ground circuit.
Driver Seat Control Unit Branch Line CircuitBKS002EE
INSPECTION PROCEDURE
1. CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the following terminals and connectors for damage, bend and loose connection (unit side and con-
nector side).
–Driver seat control unit connector
–Harness connector B46
–Harness connector B116
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of driver seat control unit.
2. Check the resistance between the driver seat control unit harness connector terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair the driver seat control unit branch line.
3. CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the driver seat control unit. Refer to SE-17, "
Schematic" .
OK or NG
OK >>
Present error: Replace the driver seat control unit. Refer to SE-103, "Removal and Installation"
.

Past error: Error was detected in the driver seat control unit branch line.
NG >> Repair the power supply and the ground circuit.
Driver seat control unit harness connector
Resistance (Ω)
Connector No. Terminal No.
B117 2 12 Approx. 54 – 66

LAN-74
[CAN]
TROUBLE DIAGNOSIS

AFS Control Unit Branch Line CircuitBKS002E7
INSPECTION PROCEDURE
1. CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the terminals and connectors of the AFS control unit for damage, bend and loose connection (unit
side and connector side).
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of AFS control unit.
2. Check the resistance between the AFS control unit harness connector terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair the AFS control unit branch line.
3. CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the AFS control unit. Refer to LT- 7 9 , "
Wiring Diagram —
AFS —" .
OK or NG
OK >>
Present error: Replace the AFS control unit. Refer to LT- 9 4 , "REMOVAL" .

Past error: Error was detected in the AFS control unit branch line.
NG >> Repair the power supply and the ground circuit.
BCM Branch Line CircuitBKS002E8
INSPECTION PROCEDURE
1. CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the terminals and connectors of the BCM for damage, bend and loose connection (unit side and
connector side).
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
AFS control unit harness connector
Resistance (Ω)
Connector No. Terminal No.
M93 2 5 Approx. 54 – 66

TROUBLE DIAGNOSIS
LAN-75
[CAN]
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2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of BCM.
2. Check the resistance between the BCM harness connector terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair the BCM branch line.
3. CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the BCM. Refer to BCS-11, "
Schematic" .
OK or NG
OK >>
Present error: Replace the BCM. Refer to BCS-16, "Removal and Installation of BCM" .

Past error: Error was detected in the BCM branch line.
NG >> Repair the power supply and the ground circuit.
Data Link Connector Branch Line CircuitBKS002E9
INSPECTION PROCEDURE
1. CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the terminals and connectors of data link connector for damage, bend and loose connection (con-
nector side and harness side).
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
Check the resistance between the data link connector terminals.
OK or NG
OK >>
Present error: Check the following items again.
–Decision of CAN system type.
–Not received CONSULT-II data (SELECT SYSTEM, SELF-DIAG RESULTS, CAN DIAG SUP-
PORT MNTR).
–Procedure for detecting root cause.

Past error: Error was detected in the data link connector branch line circuit.
NG >> Repair the data link connector branch line.
BCM harness connector
Resistance (Ω)
Connector No. Terminal No.
M3 39 40 Approx. 54 – 66
Data link connector
Resistance (Ω)
Connector No. Terminal No.
M32 6 14 Approx. 54 – 66

LAN-76
[CAN]
TROUBLE DIAGNOSIS

Intelligent Key Unit Branch Line CircuitBKS002EB
INSPECTION PROCEDURE
1. CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the terminals and connectors of the Intelligent Key unit for damage, bend and loose connection
(unit side and connector side).
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of Intelligent Key unit.
2. Check the resistance between the Intelligent Key unit harness connector terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair the Intelligent Key unit branch line.
3. CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the Intelligent Key unit. Refer to BL-78, "
Schematic" .
OK or NG
OK >>
Present error: Replace the Intelligent Key unit. Refer to BL-117, "Removal and Installation of
Intelligent Key Unit" .

Past error: Error was detected in the Intelligent Key unit branch line.
NG >> Repair the power supply and the ground circuit.
Unified Meter and A/C Amp. Branch Line CircuitBKS002EC
INSPECTION PROCEDURE
1. CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the terminals and connectors of the unified meter and A/C amp. for damage, bend and loose con-
nection (unit side and connector side).
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
Intelligent Key unit harness connector
Resistance (Ω)
Connector No. Terminal No.
M31 2 3 Approx. 54 – 66

TROUBLE DIAGNOSIS
LAN-77
[CAN]
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2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of unified meter and A/C amp.
2. Check the resistance between the unified meter and A/C amp. harness connector terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair the unified meter and A/C amp. branch line.
3. CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the unified meter and A/C amp. Refer to DI-28, "
Schematic" .
OK or NG
OK >>
Present error: Replace the unified meter and A/C amp. Refer to DI-34, "Removal and Installa-
tion of Unified Meter and A/C Amp." .

Past error: Error was detected in the unified meter and A/C amp. branch line.
NG >> Repair the power supply and the ground circuit.
Steering Angle Sensor Branch Line CircuitBKS002ED
INSPECTION PROCEDURE
1. CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the terminals and connectors of the steering angle sensor for damage, bend and loose connection
(unit side and connector side).
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of steering angle sensor.
2. Check the resistance between the steering angle sensor harness connector terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair the steering angle sensor branch line.
3. CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the steering angle sensor. Refer to BRC-48, "
Schematic"
(Models with VDC), LT- 7 9 , "Wiring Diagram — AFS —" (Models with AFS).
OK or NG
OK >>
Present error: Replace the steering angle sensor. Refer to BRC-91, "Removal and Installation"
(Models with VDC), LT- 9 4 , "REMOVAL" (Models with AFS).

Past error: Error was detected in the steering angle sensor branch line.
NG >> Repair the power supply and the ground circuit.
Unified meter and A/C amp. harness connector
Resistance (Ω)
Connector No. Terminal No.
M41 1 11 Approx. 54 – 66
Steering angle sensor harness connector
Resistance (Ω)
Connector No. Terminal No.
M26 4 5 Approx. 54 – 66

LAN-78
[CAN]
TROUBLE DIAGNOSIS

Display Control Unit Branch Line CircuitBKS002ET
INSPECTION PROCEDURE
1. CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the terminals and connectors of the display control unit for damage, bend and loose connection
(unit side and connector side).
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of display control unit.
2. Check the resistance between the display control unit harness connector terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair the display control unit branch line.
3. CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply, ignition signal and the ground circuit of the display control unit. Refer to AV- 6 4 ,
"Schematic — INF/D —" .
OK or NG
OK >>
Present error: Replace the display control unit. Refer to AV- 11 2 , "Removal and Installation of
Display Control Unit" .

Past error: Error was detected in the display control unit branch line.
NG >> Repair the power supply and the ground circuit.
Display Unit Branch Line CircuitBKS002ES
INSPECTION PROCEDURE
1. CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the terminals and connectors of the display unit for damage, bend and loose connection (unit side
and connector side).
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
Display control unit harness connector
Resistance (Ω)
Connector No. Terminal No.
M83 25 26 Approx. 54 – 66

TROUBLE DIAGNOSIS
LAN-79
[CAN]
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2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of display unit.
2. Check the resistance between the display unit harness connector terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair the display unit branch line.
3. CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply, ignition signal and the ground circuit of the display unit. Refer to AV- 4 2 , "
Schematic" .
OK or NG
OK >>
Present error: Replace the display unit. Refer to AV- 6 0 , "Removal and Installation of Display
Unit" .

Past error: Error was detected in the display unit branch line.
NG >> Repair the power supply and the ground circuit.
TCM Branch Line Circuit (Models with A/T)BKS002EG
INSPECTION PROCEDURE
1. CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the following terminals and connectors for damage, bend and loose connection (unit side and con-
nector side).
–TCM
–Harness connector M55
–Harness connector F102
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of TCM.
2. Check the resistance between the TCM harness connector terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair the TCM branch line.
Display unit harness connector
Resistance (Ω)
Connector No. Terminal No.
M47 14 16 Approx. 54 – 66
TCM harness connector
Resistance (Ω)
Connector No. Terminal No.
F104 5 6 Approx. 54 – 66

LAN-80
[CAN]
TROUBLE DIAGNOSIS

3. CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the TCM. Refer to AT- 4 2 , "
Circuit Diagram" .
OK or NG
OK >>
Present error: Replace the TCM. Refer to AT- 4 1 , "A/T Electrical Parts Location" .

Past error: Error was detected in the TCM branch line.
NG >> Repair the power supply and the ground circuit.
TCM Branch Line Circuit (Models with CVT)BKS002EH
INSPECTION PROCEDURE
1. CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the following terminals and connectors for damage, bend and loose connection (unit side and con-
nector side).
–TCM
–Harness connector M55
–Harness connector F102
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of TCM.
2. Check the resistance between the TCM harness connector terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair the TCM branch line.
3. CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the TCM. Refer to CVT-31, "
Circuit Diagram" .
OK or NG
OK >>
Present error: Replace the TCM. Refer to CVT-30, "CVT Electrical Parts Location" .

Past error: Error was detected in the TCM branch line.
NG >> Repair the power supply and the ground circuit.
ABS Actuator and Electric Unit (Control Unit) Branch Line CircuitBKS002EU
INSPECTION PROCEDURE
1. CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the terminals and connectors of the ABS actuator and electric unit (control unit) for damage, bend
and loose connection (unit side and connector side).
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
TCM harness connector
Resistance (Ω)
Connector No. Terminal No.
F106 5 6 Approx. 54 – 66