Test T

PINPOINT TEST T: THE CHARGING SYSTEM WARNING INDICATOR IS NEVER ON

Test T1-T2:

Normal Operation
The charging system warning indicator is controlled by the instrument cluster based upon data received from the powertrain control module (PCM) over the standard corporate protocol (SCP) communication network, circuits 914 (TN/OG) and 915 (PK/LB). The instrument cluster will set DTC B1317 if the battery voltage, when in the START/RUN position, exceeds 16.5 volts DC ± 0.5 volts DC. The instrument cluster will set DTC B 1318 if battery voltage, when in the START/RUN position, drops below 9 volts DC ± 0.5 volts DC.

Possible Causes
- charging system
- PCM
- instrument cluster