TM Troubleshooting (assuming OEM battery):
TROUBLESHOOTING PROCEDURE FAULT CODE 18 – BATTERY TEMPERATURE SENSOR
SYMPTOM Heater inoperative, the system fault light repeatedly flashes eighteen times, and repeatedly sounds eighteen audible warning tones. MALFUNCTION Loose battery connection.
CORRECTIVE ACTION Push the battery pack connector in securely and ensure locking tabs have engaged completely. Refer to WP 0005 00 if necessary. MALFUNCTION Damaged battery connector or wiring.
CORRECTIVE ACTION If the connector or wiring leading from the battery pack connector to the battery pack is damaged, replace the battery. Refer to WP 0043 00 if necessary.
MALFUNCTION Battery sensor malfunction.
CORRECTIVE ACTION Replace the battery with a known good battery, or a new battery. Refer to WP 0043 00 if necessary.
MALFUNCTION Damaged harness connectors or wiring.
CORRECTIVE ACTION If the connector or wiring on the inside of the heater from the battery connector to the main control board is damaged, replace the electronics box assembly, complete with wire harness IAW WP 0048 00.