P1785
TRANSMISSION WARNING LAMP - P1785The transmission warning indicator lamp is located in the instrument pack and is driven off by and active low signal from the TCM. This means that if the TCM is not connected the warning lamp will be permanently illuminated.
This diagnostic runs continuously while in initialization and operation and will detect a short circuit to battery or a short circuit to ground on the input.
Possible Causes:
Faulty wiring harness/connectors.
Faulty indicator lamp.
Faulty instrument pack.
Effects:
Permanent illumination of indicator lamp on instrument pack (if TCM or wiring faulty).
Remedy:
Repair or renew harness/connector.
Renew indicator lamp.
Examine instrument pack fault diagnosis.
Troubleshooting Schematic
Key To Schematic Diagrams
1. Transmission Control Module (TCM)
2. Transmission Unit
3. TCM Multi-pin Connector
4. Transmission Rotary Switch
5. Transmission Connector Plug
6. Engine Control Module
7. Instrument Pack
8. ABS/Traction Control Control Module
9. Kickdown Switch
Pin Outs