BACKUP POWER SUPPLY INSPECTION


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1.  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.)

2.  Remove the backup power supply.(See BACKUP POWER SUPPLY REMOVAL/INSTALLATION [(E)].)

3.  Connect the backup power supply connector.

4.  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.)

5.  Verify that the voltages of each of the terminals are as indicated in the terminal voltage table (reference).

•  If the voltage is not as specified in the terminal voltage table (reference), inspect the parts under Inspection item(s) and related wiring harnesses.
―  If the system does not operate normally even though the inspection items are normal, replace the backup power supply.(See BACKUP POWER SUPPLY REMOVAL/INSTALLATION [(E)].)


Terminal Voltage Table (Reference)

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Terminal

Signal name

Connected to

Test condition

Voltage (V)

Inspection item

1A
GND
Body ground
Under any condition
Approx. 0
•  GND point
•  Related wiring harness
1B
GND
Body ground
Under any condition
Approx. 0
•  GND point
•  Related wiring harness
1D
Info
Electrical supply unit (ESU)
Under any condition
Hi : Approx. 9
Low : Approx. 5
•  Electrical supply unit (ESU)
•  Related wiring harness
1F
Power supply
Door-electrical supply unit (passenger's side)
Under any condition
11.7 or less
•  Door-electrical supply unit (passenger's side)
•  Related wiring harness
1G
Power supply
F9 15A fuse
Under any condition
B+
•  F9 15A fuse
•  Related wiring harness
1I
Power supply (IG1)
F49 15A fuse
Switch the main power ON (READY off or on)
B+
•  F49 15A fuse
•  Related wiring harness
Switch the main power OFF
1.0 or less
1J
Power supply
Door-electrical supply unit (driver's side)
Under any condition
11.7 or less
•  Door-electrical supply unit (driver's side)
•  Related wiring harness
2B
Power supply
PCM
Under any condition
Hi : 3.5 or more
Low : 0.7 or less
•  PCM
•  Related wiring harness
2D
Power supply
•  PCM
•  Drive inverter (DMCM)
Under any condition
11.7 or less
•  PCM
•  Drive inverter (DMCM)
•  Related wiring harness