Charging System Indicator Circuit Troubleshooting
  1. Turn the ignition switch to ON (II).
Does the charging system indicator come on?
YES -
Go to Step 2 .
NO -
Go to Step 14 .
  1. Start the engine. Hold the engine speed at 2,000 rpm (min −1 ) for 1 minute.
Does the charging system indicator go off?
YES -
Charging system indicator circuit is OK. Go to the alternator and regulator circuit troubleshooting. ■
NO -
Go to Step 3 .
Does the charging system indicator flash?
YES -
Go to Step 4 .
NO -
Replace the gauge control module. ■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the alternator 4P connector.
  1. Turn the ignition switch to ON (II).
    NOTE: The charging system indicator may come on and then go off.
Does the charging system indicator go off?
YES -
NO -
Go to Step 7 .
  1. Turn the ignition switch to LOCK (0).
  1. Turn the ignition switch to ON (II).
  1. Jump the SCS line with the HDS, then turn the ignition switch to LOCK (0).
    NOTE: This step must be done to protect the ECM from damage.
  1. Disconnect ECM connector B (49P).
  1. Check for continuity between ECM connector terminal B46 and body ground.
Is there continuity?
YES -
Repair short in the wire between the alternator and the ECM (B46).■
NO -
Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM. ■
Does the charging system indicator flash?
YES -
Go to Step 15 .
NO -
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the alternator 4P connector.
  1. Connect alternator 4P connector terminal No. 3 to body ground with a jumper wire.
  1. Turn the ignition switch to ON (II).
Does the charging system indicator come on?
YES -
NO -
Disconnect the jumper wire, then go to Step 19 .
  1. Turn the ignition switch to ON (II).
  1. Jump the SCS line with the HDS, then turn the ignition switch to LOCK (0).
    NOTE: This step must be done to protect the ECM from damage.
  1. Disconnect ECM connector B (49P).
  1. Check for continuity between ECM connector terminal B46 and alternator 4P connector terminal No. 3.
Is there continuity?
YES -
Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM. ■
NO -
Repair open in the wire between the alternator and the ECM.■