Lexus NX: Lost Communication with EMV (B1321)
DESCRIPTION
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Memory |
|---|---|---|---|---|
| B1321 | Lost Communication with EMV |
|
| DTC stored |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
After the power switch is turned off, there may be a waiting time before disconnecting the negative (-) battery terminal.
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-
When disconnecting the cable from the auxiliary negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.
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- When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
-
The following malfunctions may occur if a radio receiver assembly from another vehicle is installed to this vehicle. Therefore, when replacing the radio receiver assembly, be sure to replace it with new one.
- Communication malfunction DTC is output
- Does not operate normally
HINT:
- B1321 will not continue to output when clear DTC is performed even if the malfunction continues.
-
Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed.
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PROCEDURE
| 1. | CHECK FOR DTC (NAVIGATION SYSTEM) |
(a) Check if navigation system DTCs are output.
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| Result | Proceed to |
|---|---|
| Navigation system DTCs are not output. | A |
| Navigation system DTCs are output. | B |
| B | .gif) | GO TO NAVIGATION SYSTEM |
|
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| 2. | CHECK HARNESS AND CONNECTOR (NO. 9 CAN JUNCTION CONNECTOR - RADIO RECEIVER ASSEMBLY) |
| *a | Rear view of wire harness connector (to No. 9 CAN Junction Connector) |
(a) Disconnect the No. 9 CAN junction connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I166-7 - I166-18 | Cable disconnected from auxiliary negative (-) battery terminal | 108 to 132 Ω |
| NG | | GO TO STEP 5 |
|
| 3. | CHECK HARNESS AND CONNECTOR (NO. 9 CAN JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY) |
| *a | Rear view of wire harness connector (to No. 9 CAN Junction Connector) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I166-8 - I166-19 | Cable disconnected from auxiliary negative (-) battery terminal | 200 Ω or higher |
| OK | | REPLACE NO. 9 CAN JUNCTION CONNECTOR |
|
| 4. | CHECK HARNESS AND CONNECTOR (NO. 9 CAN JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY) |
| *a | Front view of wire harness connector (to Combination Meter Assembly Connector) |
(a) Disconnect the combination meter assembly connector.
(b) Reconnect the I166 No. 9 CAN junction connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I11-10 (MSCH) - I11-9 (MSCL) | Cable disconnected from auxiliary negative (-) battery terminal | 54 to 69 Ω |
| OK | | REPLACE COMBINATION METER ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 5. | CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - NO. 9 CAN JUNCTION CONNECTOR) |
| *a | Front view of wire harness connector (to Radio Receiver Assembly Connector) |
(a) Disconnect the radio receiver assembly connector.
(b) Reconnect the I166 No. 9 CAN junction connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I53-5(CNH1) - I53-6(CNL1) | Cable disconnected from auxiliary negative (-) battery terminal | 108 to 132 Ω |
| OK | | REPLACE RADIO RECEIVER ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use the following procedure to troubleshoot the lighting system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT 2. INSPECT AUXILIARY BATTERY VOLTAGE (a) Measure the auxiliary battery voltage with power swi
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