Toyota Yaris: Charging System / Lost Communication with Battery Monitor Module Missing Message (P162B87)
DESCRIPTION
The ECM and battery state sensor assembly each detect reception malfunctions. A battery state sensor assembly reception malfunction detected by the battery state sensor assembly is sent to the ECM via LIN communication. If there is a malfunction in either the ECM or battery state sensor assembly, the ECM determines that there is a LIN communication malfunction and outputs a DTC.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Note |
|---|---|---|---|---|---|
| P162B87 | Lost Communication with Battery Monitor Module Missing Message | Battery state sensor assembly or ECM communication stops for approximately 17 minutes or more with the ignition switch to ON (1 trip detection logic) |
| Does not come on | SAE Code: P162B |
WIRING DIAGRAM
Refer to the wiring diagram for the P062049.
Click here
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
- Before replacing the ECM, refer to Service Bulletin.
PROCEDURE
| 1. | CHECK BATTERY STATE SENSOR ASSEMBLY INSTALLATION CONDITION |
HINT:
Click here
| NG |
 | INSTALL BATTERY STATE SENSOR ASSEMBLY CORRECTLY |
|
| 2. | CHECK CHARGING SYSTEM |
HINT:
Click here
| NG |
 | REPAIR OR REPLACE CHARGING SYSTEM |
|
| 3. | CHECK HARNESS AND CONNECTOR (ECM - BATTERY STATE SENSOR ASSEMBLY) |
(a) Disconnect the D104 ECM connector.
(b) Disconnect the O68 battery state sensor assembly connector.
(c) Disconnect the D53 generator assembly connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| D104-62 (LIN) - O68-2 (LIN) | Always | Below 1 Ω |
Standard Resistance (Check for Short):
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| D104-62 (LIN), D53-2 (LIN) or O68-2 (LIN) - Body ground | Ignition switch off (while LIN communication stopped) | 10 kΩ or higher |
| NG |
 | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. | CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) |
(a) Check that the battery state sensor assembly connector is securely connected.
OK:
The connector is securely connected.
| (b) Disconnect the O68 battery state sensor assembly connector. |
|
(c) Check the connector case and terminals for deformation or corrosion.
OK:
No deformation or corrosion.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| O68-3 (+B) - Body ground | Always | 11 to 14 V |
| NG |
 | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 5. | CLEAR DTC |
(a) Check for DTCs using the GTS, and then write them down.
Powertrain > Engine > Trouble Codes(b) Clear the DTCs.
Powertrain > Engine > Clear DTCs
|
| 6. | READ OUTPUT DTC |
(a) Start the engine and wait 17 minutes or more.
(b) Using the GTS, read the DTCs.
Powertrain > Engine > Trouble Codes| Result | Proceed to |
|---|---|
| Only P162B87 is output | A |
| P161A87 and P162B87 are output | B |
| DTCs are not output | C |
| A |
 | REPLACE BATTERY STATE SENSOR ASSEMBLY |
| B |
 | REPLACE ECM |
| C |
 | CHECK FOR INTERMITTENT PROBLEMS |
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