DTC B1321-87: Lost Communication with EMV Missing Message [10/2022 - ]: Procedure
- CHECK FOR DTC (EACH SYSTEM)
- Check each system for DTCs.
Body Electrical > Combination Meter > Trouble Codes
Body Electrical > Navigation System > Trouble Codes
- Confirm the DTC combinations of the following table.
DTC Output Pattern DTC Output Part Name
(Display on GTS)Combination Meter Assembly
(Combination Meter)Radio and Display Receiver Assembly
(Navigation System)1 B1321-87 U11D0-87 2 B1321-87 Not output Result
Result Proceed to DTC output pattern 1 A DTC output pattern 2 B
Result:
B
See step 3
Result:
A
See step 2
- Check each system for DTCs.
- INSPECT EACH ECU (INTERNAL MALFUNCTION)
- Remove 1 of the following ECUs.
- Radio and display receiver assembly
Refer to REMOVAL [10/2022 - ]
- Combination meter assembly
Refer to REMOVAL [10/2022 - ]
- Radio and display receiver assembly
- Measure the resistance of the removed ECU.NOTE:
- Refer to the following table for the specified conditions of each ECU.
- If the specified conditions are met, repeat the inspection procedure from step (a) for another ECU.
HINT:
If the results of an ECU are not as specified, it is suspected that the ECU is the cause of the DTC.
- Inspect the radio and display receiver assembly (w/o Navigation System).
Standard Resistance
Tester Connection Condition Specified Condition E137-11 (CNH1) - E137-12 (CNL1) Always 108 to 132 Ω *a Component without harness connected
(Radio and Display Receiver Assembly) - Inspect the combination meter assembly.
*a Component without harness connected
(Combination Meter Assembly)Standard Resistance
Tester Connection Condition Specified Condition E17-36 (TX+) - E17-37 (TX-) Always 108 to 132 Ω
Result
Result Proceed to The results of all ECUs are as specified A The results of the radio and display receiver assembly are not as specified B The results of the combination meter assembly are not as specified C
Result:
A
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
B
REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to REMOVAL [10/2022 - ]
Result:
C
REPLACE COMBINATION METER ASSEMBLY. Refer to REMOVAL [10/2022 - ]
- Remove 1 of the following ECUs.
- CHECK FOR DTC (METER / GAUGE SYSTEM)
- Disconnect the cable from the negative (-) auxiliary battery terminal.
HINT:
By disconnecting the cable from the negative (-) auxiliary battery terminal, the internally stored information related to local bus communication for the combination meter assembly is reset.
- Disconnect the E137 radio and display receiver assembly connector.
- Connect the cable to the negative (-) auxiliary battery terminal.
- Turn the ignition switch to ON.
- Clear the DTCs.
Body Electrical > Combination Meter > Clear DTCs
- Wait 30 seconds or more.
- Check for DTCs.
Body Electrical > Combination Meter > Trouble Codes
HINT:
By resetting the internally stored information related to local bus communication, the detection conditions of DTC B1321-87 are not met as the combination meter assembly does not detect the radio and display receiver assembly. If the combination meter assembly is operating normally, DTC B1321-87 will not be stored.
Result:
Result Proceed to DTC B1321-87 is not output A DTC B1321-87 is output B
Result:
A
REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to REMOVAL [10/2022 - ]
Result:
B
REPLACE COMBINATION METER ASSEMBLY. Refer to REMOVAL [10/2022 - ]
- Disconnect the cable from the negative (-) auxiliary battery terminal.