RAM 3500 Truck 4WD L6-5.9L DSL Turbo VIN C (2002)
If not OK, repair the open B(+) to heated seat module circuit to the heated seat module as required.
4. The coil battery terminal (86) is connected to the electromagnet in the relay It is connected to battery voltage and should be hot at all times. Check
for battery voltage at the cavity for relay terminal 86.
If OK, go to Step 5.
If not OK, repair the open circuit to the fused B(+) fuse in the PDC as required.
5. The coil ground terminal (85) is connected to the electromagnet in the relay. It is grounded by the premium version of the Central Timer Module (
CTM) in response to an engine speed message received over the Chrysler Collision Detection (CCD) data bus from the Powertrain Control
Module (PCM) when the engine is running.
Check for continuity between the cavity for relay terminal 85 and the heated seat relay control circuit cavity of the CTM wire harness connector.
There should be continuity at all times.
If OK, use a DRB III scan tool and the proper diagnostic procedures to test the operation of the CTM and CCD data bus. See: Body Control
Systems/Body Control Module See: Powertrain Management/Computers and Control Systems/Information Bus
If not OK, repair the open heated seat relay control circuit as required.
