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12V Battery Charge Warning Light
 
 
DESIGN/PURPOSE
Charge warning light warns the driver for the unexpected power generation.
 
 
BULB CHECK
For 2 seconds after the ignition switch is turned ON.
 
 
SYNCHRONIZATION WITH MASTER WARNING LIGHT
Not applicable
 
 
OPERATION AT COMBINATION METER CAN COMMUNICATION CUT-OFF OR UNUSUAL SIGNAL
For actions on CAN communications blackout in the combination meter, refer to Fail-Safe.
 
 
SYSTEM DIAGRAM
 
 
SIGNAL PATH
  • ECM transmits battery warning request signal (ECM) to combination meter via CAN communication when the operation of alternator is unexpected.
  • IPDM E/R transmits battery warning request signal (IPDM E/R) to combination meter via CAN communication when excessive voltage is detected on battery positive terminal.
  • Combination meter indicates charge warning light judged with battery warning request signal received from ECM or IPDM E/R.
 
 
LIGHTING CONDITION
When any of the following symptoms occur while alternator is operating:
  • Communication between alternator and ECM is malfunctioning.
  • Excessive voltage is produced.
  • No voltage is produced.
  • Excessive voltage is detected on battery positive terminal
 
 
SHUTOFF CONDITION
When any of the condition listed below is satisfied:
  • Ignition switch is OFF.
  • The power generation of generator is normal.