Lexus ES: Hybrid/EV Battery Internal Electronic Failure (P31B549)
DESCRIPTION
The battery ECU assembly monitors its internal operation and will store these DTCs when it detects an internal malfunction.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate |
|---|---|---|---|---|---|
| P31B549 | Hybrid/EV Battery Internal Electronic Failure | An abnormal signal is detected by the battery ECU assembly (excessive discharging current). (1 trip detection logic) | Hybrid vehicle control ECU | Does not come on | Master Warning Light: Comes on |
| DTC No. | Data List |
|---|---|
| P31B549 | Hybrid/EV Battery Current |
CONFIRMATION DRIVING PATTERN
HINT:
After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
Click here .gif)
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG) and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off and wait for 2 minutes or more.
- Turn the power switch on (IG) and turn the Techstream on.
- Drive the vehicle on urban roads for approximately 10 minutes.
- Enter the following menus: Powertrain / HV battery / Utility / All Readiness.
-
Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or N/A, perform driving pattern again.
PROCEDURE
| 1. | CHECK DTC OUTPUT (HV BATTERY, HYBRID CONTROL) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Enter the following menus: Powertrain / HV Battery and Hybrid Control / Trouble Codes.
(d) Check for DTCs.
Powertrain > HV Battery > Trouble Codes Powertrain > Hybrid Control > Trouble Codes| Result | Proceed to |
|---|---|
| "P31B549" only is output. | A |
| DTCs except "P31B549" of hybrid battery system are output. | B |
| DTCs except "P31B549" of hybrid control system are output. | C |
(e) Turn the power switch off.
| A | .gif) | REPLACE HYBRID VEHICLE CONTROL ECU |
| B | | GO TO DTC CHART (HYBRID BATTERY SYSTEM) |
| C | | GO TO DTC CHART (HYBRID CONTROL SYSTEM) |
READ NEXT:
Hybrid/EV Battery Stack 1 Circuit Resistance Out of Range (P33DA1E,P33DB1E)
DESCRIPTION The HV battery is composed of 70 cells (3.7 V each) in series. The battery ECU assembly monitors the internal resistance of each HV battery cell to detect malfunctions of the HV battery.
Hybrid/EV Battery Stack 1 Circuit Resistance Above Threshold (P33E01B,P33E11B)
DESCRIPTION The HV battery is composed of 70 cells (3.7 V each) in series. The battery ECU assembly monitors the internal resistance of each HV battery cell to detect malfunctions of the HV battery.
(Extreme) Hybrid/EV Battery Stack 1 Cell Circuit Voltage Below Threshold (P33EC16,P33ED16)
DESCRIPTION If the voltage of an HV battery cell is lower than the threshold for a certain amount of time, the battery ECU assembly will interpret this as a malfunction. DTC No. Detection Item
SEE MORE:
System Diagram
SYSTEM DIAGRAM Communication Table Sender Receiver Signal Line Main Body ECU (Multiplex Network Body ECU) Outer Mirror Control ECU Assembly
IG signal
ACC signal
Outer mirror switch assembly signal
Mirror position request signal (memory and reactivation function)
Mirror
Installation
INSTALLATION PROCEDURE 1. INSTALL STOP LIGHT SWITCH ASSEMBLY (a) Insert the stop light switch assembly until the threaded sleeve hits the pedal as shown in the illustration. *1 Stop Light Switch Mounting Adjuster Insert in this Direction NOTICE: When inserting the stop light switch a
