How do I fix heated seats?

[HUMTECH]

Heated Seat Inoperative
Step
Action
Yes
No
Schematic Reference: Driver Seat Schematics and 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
Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
Operate the Heated Seat System.
Does the system operate normally?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
Go to Step 3
3

1. <LI type=1>Install a scan tool. <LI type=1>Start the engine. <LI type=1>Display the Heated Seat Status and Zone parameters in the driver seat module (DSM) Input/Output data list.
2. Operate the heated seat switch in all modes.

Does the scan tool display the correct Heated Seat parameters in relation to heated seat switch operation?
Go to Step 8
Go to Step 4
4

1. <LI type=1>Display the Heated Seat Switch parameters in the door module Inputs data list.
2. Press the head seat switches while observing the scan tool parameters.

Does the scan tool display the heated seat switches as active while the switches are pressed?
Go to Step 5
Go to Step 6
5
Do the heated seat switch indicators operate normally?
Go to Step 13
Go to Step 12
6

1. <LI type=1>Disconnect the heated seat switch harness connector to the door module.
2. Test the resistance through the heated seat switch from the voltage supply circuit terminal to the back only select switch signal circuit terminal while operating the heat level switch.

Does the back only select switch have continuity only when pressed?
Go to Step 7
Go to Step 10
7
Test the resistance through the heated seat switch from the voltage supply circuit terminal to the back/cushion select switch signal circuit terminal while operating the back/cushion select switch.
Does the back/cushion select switch have continuity only when pressed?
Go to Step 12
Go to Step 10
8

1. <LI type=1>Disconnect the inoperative seat heater element connector. <LI type=1>Connect a test lamp from the voltage supply circuit terminal to the control circuit terminal in the harness connector.
2. Operate the seat back and cushion switch to the high mode.

Does the test lamp illuminate?
Go to Step 11
Go to Step 9
9
Test the seat heater element voltage supply and ground circuits in the seat harness for an open or short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 18
Go to Step 13
10
Inspect for poor connections at the heated seat switch harness connector to the door module. 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 18
Go to Step 14
11
Inspect for poor connections at the heated seat element 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 18
Go to Step 15
12
Inspect for poor connections at the door module. 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 18
Go to Step 16
13
Inspect for poor connections at the DSM. 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 18
Go to Step 17