When the heated seat system is activated, the body control module (BCM) controls the heated seat operation through the heated seat relay control circuit and the heated seat relay. The relay energizes and applies battery positive voltage to the seat heater elements. The circuit that generated this DTC is the heated seat relay control circuit that is wired between the BCM and the heated seat relay.
This diagnostic procedure supports the following DTCs:
• | DTC B2508 Seat Heater Relay Circuit |
• | DTC B2509 Seat Heater Relay Circuit |
• | The BCM must be powered and cannot have B1327, Battery Voltage Low, as an active DTC for this DTC to set. |
• | The BCM monitors the voltage of this circuit at all times, even when the ignition is in the OFF position. |
• | The module voltage must be 9-16 volts. |
• | Open detected when the output is inactive. |
• | Short to battery positive voltage detected when the output is inactive. |
• | Short to ground detected when the output is inactive |
• | Open in the ground circuit of the heated seat relay. |
Current and history DTCs are stored.
The BCM will clear the current DTC when the short to ground, battery voltage, or open is no longer present.
The numbers below refer to the step numbers on the diagnostic table.
During the heated seat relay operation, listen for an audible click from the relay. Repeat the commands, as necessary.
This step verifies that the BCM is providing voltage to the heated seat relay.
This step tests for an open in the ground circuit to the heated seat relay.
Step | Action | Yes | No | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Driver Seat Schematics or Passenger Seat Schematics Connector End View Reference: Power Seat Connector End Views | |||||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |||||||||||
Does the heated seat relay turn ON and OFF with each command? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 | |||||||||||
3 |
Does the test lamp illuminate? | Go to Step 9 | Go to Step 4 | ||||||||||
Does the test lamp turn ON and OFF with each command? | Go to Step 5 | Go to Step 6 | |||||||||||
Does the test lamp turn ON and OFF with each command? | Go to Step 7 | Go to Step 10 | |||||||||||
6 | Test the heated seat relay control circuit of the heated seat relay for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs. Did you find and correct the condition? | Go to Step 13 | Go to Step 8 | ||||||||||
7 | Inspect for poor connections at the harness connector of the heated seat relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs. Did you find and correct the condition? | Go to Step 13 | Go to Step 11 | ||||||||||
8 | Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 12 | ||||||||||
9 | Test for a short to battery positive voltage in the heated seat relay control circuit. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 8 | ||||||||||
10 | Repair the open in the ground circuit of the heat seat relay. Refer to Wiring Repairs . Did you complete the repair? | Go to Step 13 | -- | ||||||||||
11 | Replace the heated seat relay. Refer to Front Seat Heater Relay Replacement . Did you complete the replacement? | Go to Step 13 | -- | ||||||||||
12 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 13 | -- | ||||||||||
13 |
Does the DTC reset? | Go to Step 2 | System OK |