Battery Temperature Sensor (BTS)

Connect scan tool. Turn ignition on. Using scan tool, select SENSORS. Read and record ambient battery temperature. Using a temperature probe, read and record the air temperature near the BTS, located on bottom of battery tray. If readings vary by more than 10°F, replace BTS. If readings vary by 10°F or less, check wiring, terminals and connectors. Repair as necessary. Start engine. Check BTS output while wiggling wiring. If temperature changes, repair wiring as necessary. If no problems are found, test is complete.