For 1990-2009 cars

Step | Action | Values | Yes | No
--- | --- | --- | --- | ---
Schematic Reference: Heated Seats Schematics Connector End View Reference:
1 | Did you review the Heated Seat System Description and Operation and perform the necessary inspections? | -- | Go to Step 2 | Go to Symptoms - Seats
2 |

1. Turn the ignition on.
2. Operate the heated seat switch in the high, low, and off switch positions.

Does the heated seat system operate normally?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3 | Does the heated seat switch indicator operate normally? | -- | Go to Step 7 | Go to Step 4
4 |

1. Disconnect the heated seat switch connector.
2. Connect a test lamp from the ignition voltage supply circuit terminal in the harness connector to a good ground.

Does the test lamp illuminate?

--

Go to Step 5

Go to Step 13

5 | Connect a test lamp from the ignition voltage supply circuit terminal to the ground circuit terminal in the heated seat switch harness connector. Does the test lamp illuminate? | -- | Go to Step 6 | Go to Step 14
6 |

1. Disconnect the heated seat terminals 1 and 2 connector from the power seat body harness connector.
2. Test the heated seat switch signal circuit for a short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 21

Go to Step 17

7 |

1. Disconnect the heated seat terminals 3 and 4 connector from the power seat body harness connector.
2. Connect a test lamp from the heated seat module ignition voltage supply circuit terminal in the body harness connector to a good ground.

Does the test lamp illuminate?

--

Go to Step 8

Go to Step 15

8 | Connect a test lamp from the ignition voltage supply circuit terminal to the ground circuit terminal in the body harness connector. Does the test lamp illuminate? | -- | Go to Step 9 | Go to Step 16
9 |

1. Disconnect the heated seat terminals 1 and 2 connector from the power seat body harness connector.
2. Connect a test lamp from the heated seat switch signal circuit terminal in the body harness connector to ground.
3. Operate the heated seat switch in the high and low positions.

Does the test lamp illuminate in the high and low switch positions?

--

Go to Step 10

Go to Step 11

10 |

1. Using a DMM test the resistance from the heated seat switch high/low signal circuit terminal in the body harness connector to ground.
2. Operate the heated seat switch in the following positions:

• | High

• | Low

• | Off

Are the resistance measurements at or near the specified values?

• | High 2.5 K ohms

• | Low 6.5 K ohms

• | Off 10.5 K ohms

Go to Step 18

Go to Step 12

11 | Test the heated seat switch signal circuit for an open or high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 21 | Go to Step 17
12 | Test the high/low switch signal circuit for the following conditions:

• | An open

• | A short to ground

• | A short to voltage

Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 21

Go to Step 17

13 | Repair the ignition voltage supply circuit to the heated seat switch for an open or short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 21 | --
14 | Repair the heated seat switch ground circuit for an open or high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 21 | --
15 | Repair the ignition voltage supply circuit to the heated seat module for an open or short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 21 | --
16 | Repair the heated seat module ground circuit for an open or high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 21 | --
17 | Inspect for poor connections at the heated seat switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 21 | Go to Step 19
18 | Inspect for poor connections at the power seat harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 21 | Go to Step 20
19 | Replace the heated seat switch. Refer to Heated Seat Switch Replacement . Is the repair complete? | -- | Go to Step 21 | --
20 | Replace the seat cushion heater element. Refer to Driver Seat and Passenger Seat Cushion Heater Replacement . Is the repair complete? | -- | Go to Step 21 | --
21 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2