CHECK AT THE BMU TERMINALS



TERMINAL VOLTAGE CHECK CHART




Terminal No.
Inspection Item
Check Condition (Vehicle Status)
Normal Condition
1
auxiliary battery power supply
Electric motor switch: "LOCK" (OFF)
System voltage
2
EV-ECU control power supply
Electric motor switch: "LOCK" (OFF)
1 V or less
Electric motor switch: ON
System voltage
12
Main battery cooling fan relay
Electric motor switch: ON
1 V or less
Right after starting the regular charge
Voltage lower than system voltage by approximately 1 V → 1 V or less (after several seconds elapse)
13
Main battery cooling fan PWM signal
Electric motor switch: ON
1 V or less
Right after starting the regular charge
Wave pattern output *1
21
Main battery cooling fan rotational speed signal input
Electric motor switch: ON
0.0 - 0.2 V
Right after starting the regular charge
More than 2 V → less than 1 V (after several seconds elapse)
31
Main battery current sensor applied voltage
Electric motor switch: ON
4.75 - 5.25 V
32
Main battery current sensor (high)
Electric motor switch: ON
2.45 - 2.55 V
During the regular charging
2.45 - 2.61 V

  • Electric motor switch: READY
  • A/C set temperature: maximum temperature
  • MAX switch: ON

Value changes by value less than 2.55 V.
33
Main battery current sensor (low)
Electric motor switch: ON
2.45 - 2.55 V
During the regular charging
2.45 - 3.21 V

  • Electric motor switch: READY
  • A/C set temperature: maximum temperature
  • MAX switch: ON

Value changes by value less than 2.55 V.
35
Main battery ground fault detector
Electric motor switch: "LOCK" (OFF) → ON
More than 8 V → less than 1.3 V (after several seconds elapse)
46
Main battery ground fault detector pre-check signal
Electric motor switch: "LOCK" (OFF) → ON
More than 5.3 V → less than 1 V (after several seconds elapse)
note *1: Use the oscilloscope to check the output wave pattern. (Refer to ).

CHECK CHART FOR RESISTANCE AND CONTINUITY BETWEEN CONNECTOR TERMINALS AT HARNESS SIDE




Terminal No.
Inspection Item
Standard value and normal status (check condition)
3-body earth
Earth
Continuity (less than 2 Ω )
31 - 42
Main battery current sensor power supply
1 - 5 kΩ (at 25°C)
32 - 42
Main battery current sensor (high)
1 - 5 kΩ (at 25°C)
33 - 42
Main battery current sensor (low)
1 - 5 kΩ (at 25°C)
37 - 38
Local CAN (for main battery) end resistance
80 - 96 Ω (at 20°C)