Operation CHARM: Car repair manuals for everyone.
Home >> Dodge or Ram Truck >> 2010 >> RAM 1500 Truck 4WD V8-4.7L >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> B Code Charts >> B1EB4 >> B1EB4-1B

B1EB4-1B






B1EB4-1B-REAR RIGHT SEAT HEATER SENSOR - CIRCUIT RESISTANCE ABOVE THRESHOLD







- When Monitored:
When Heated Seat Module (HSM) is powered.

- Set Condition:
The HSM detects that the (P673) Right Rear Heated Seat Temp Sense circuit NTC is above threshold for more than two seconds.





1. TEST FOR INTERMITTENT CONDITION

NOTE: Make sure the battery is fully charged and the charging system is operating properly before proceeding.

1. Turn the ignition on.
2. Using a scan tool, record and erase Diagnostic Trouble Codes (DTCs).
3. Turn the ignition off.
4. Start the engine and let it run.
5. Using a scan tool, read DTCs.

Is the DTC active?

Yes

- Go To 2

No

- The conditions that caused this code to set are not present at this time. Verify seat harness is routed correctly to the HSM. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals. Attempt to reproduce condition by operating all HSM functions one at a time. Attempt to reproduce condition by adjusting the front seat.
- Perform BODY VERIFICATION TEST Body Verification Test.

2. CHECK (P673) RIGHT REAR HEATED SEAT TEMP SENSE CIRCUIT FOR A SHORT TO VOLTAGE




1. Turn the ignition off.
2. Disconnect the HSM C3 connector.

NOTE: Check connectors. Clean and repair as necessary.

3. Start the engine and let it run.
4. Measure the Voltage of the (P673) Right Rear Heated Seat Temp Sense circuit between the HSM C3 connector and ground.

Is there any voltage present?

Yes

- Go To 3

No

- Go To 4

3. CHECK (P673) RIGHT REAR HEATED SEAT TEMP SENSE CIRCUIT FOR A SHORT TO (F931) FUSED IGNITION RUN CONTROL OUTPUT CIRCUIT




1. Turn the ignition off.
2. Measure the resistance between the (P673) Right Rear Heated Seat Temp Sense circuit and the (F931) Fused Ignition Run Control Output circuit at HSM C3 connector.

Is the resistance below 10K ohms?

Yes

- Repair the (P673) Right Rear Heated Seat Temp Sense circuit for a short to the (F931) Fused Ignition Run Control Output circuit.
- Perform BODY VERIFICATION TEST Body Verification Test.

No

- Repair the (P673) Right Rear Heated Seat Temp Sense circuit for a short to Voltage.
- Perform BODY VERIFICATION TEST Body Verification Test.

4. CHECK (P673) RIGHT REAR HEATED SEAT TEMP SENSE CIRCUIT FOR A SHORT TO VOLTAGE DURING SEAT ADJUSTMENT




1. Measure the Voltage of the (P673) Right Rear Heated Seat Temp Sense circuit between the HSM C3 connector and ground while adjusting the front seat.

Is there any Voltage present during the seat adjustment?

Yes

- Repair the (P673) Right Rear Heated Seat Temp Sense circuit for a short to Voltage.
- Perform BODY VERIFICATION TEST Body Verification Test.

No

- Go To 5

5. CHECK (P673) RIGHT REAR HEATED SEAT TEMP SENSE CIRCUIT FOR A SHORT TO (P178) RIGHT REAR SEAT HEATER CONTROL CIRCUIT OR TO (P177) LEFT REAR SEAT HEATER CONTROL CIRCUIT




1. Turn the ignition off.
2. Disconnect the Right Rear Seat Cushion Heater connector.
3. Disconnect the Left Rear Seat Cushion Heater connector.

NOTE: Check connectors. Clean and repair as necessary.

4. Measure the resistance between the (P673) Right Rear Heated Seat Temp Sense circuit and the (P178) Right Rear Seat Heater Control circuit at the HSM C3 connector.
5. Measure the resistance between the (P673) Right Rear Heated Seat Temp Sense circuit and the (P177) Left Rear Seat Heater Control circuit at the HSM C3 connector.

Is the resistance below 10K ohms for either measurement?

Yes

- Repair all circuits with a resistance below 10K ohms for a short to the (P673) Right Rear Heated Seat Temp Sense circuit.

No

- Go To 6

6. CHECK (P673) RIGHT REAR HEATED SEAT TEMP SENSE CIRCUIT VOLTAGE TO RIGHT REAR SEAT CUSHION HEATER




1. Reconnect the HSM C3 connector.
2. Start the engine and let it run.
3. Measure the Voltage between the (P673) Right Rear Heated Seat Temp Sense circuit and the (P968) Heated Seat Sensor Return circuit at the Right Rear Seat Cushion Heater connector (harness side).

Is the Voltage above 4.5 Volts?

Yes

- Replace the Rear Seat Cushion Heater Element.
- Perform BODY VERIFICATION TEST Body Verification Test.

No

- Go To 7

7. CHECK (P673) RIGHT REAR HEATED SEAT TEMP SENSE CIRCUIT FOR AN OPEN




1. Turn the ignition off.
2. Disconnect the HSM C3 connector.
3. Measure the resistance of the (P673) Right Rear Heated Seat Temp Sense circuit between the HSM C3 connector and the Right Rear Seat Cushion Heater connector (harness side).

Is the resistance below 5.0 ohms?

Yes

- Go To 8

No

- Repair the (P673) Right Rear Heated Seat Temp Sense circuit for an open.
- Perform BODY VERIFICATION TEST Body Verification Test.

8. CHECK (P968) HEATED SEAT SENSOR RETURN CIRCUIT FOR AN OPEN




1. Measure the resistance of the (P968) Heated Seat Sensor Return circuit between the HSM C3 connector and the Right Rear Seat Cushion Heater connector (harness side).

Is the resistance below 5.0 ohms?

Yes

- Replace the Heated Seat Module (HSM).
- Perform BODY VERIFICATION TEST Body Verification Test.

No

- Repair the (P968) Heated Seat Sensor Return circuit for an open.
- Perform BODY VERIFICATION TEST Body Verification Test.

pro multis · About Operation CHARM