RIGHT SEAT HEATER INOPERATIVE
1. If a heated seat heats but one or both indicator
lamps (LED’s) on the heated seat switch fail to illu-
minate, check the driver circuit with the inoperative
LED for a short to ground. If OK, replace the
heated seat switch. If NOT OK repair the short to
ground as required and than replace the heated
seat switch.
NOTE: IF THE RIGHT SEAT CUSHION IS ALREADY
WARM THE FOLLOWING STEP WILL NOT PROVE
CONCLUSIVE.
2. Back-probe the heated seat module wire harness connector, do not disconnect. Check cavity #3 for battery volt-
age when the right heated seat switch is turned “ON”, voltage should be present, If OK go to Step 3 If NOT OK,
test the right heated seat switch (Refer to 8 - ELECTRICAL/HEATED SEATS/SEAT SWITCH - DIAGNOSIS AND
TESTING). If the switch tests OK, check for continuity between the switch and control module on the MUX cir-
cuit, If OK replace the heated seat control module. If NOT OK, repair the open or shorted MUX circuit as
required.
3. Back-probe the heated seat module wire harness connector, do not disconnect. Check cavity #10 for battery
voltage, while observing the voltmeter depress the right heated seat switch low setting twice, voltage should
toggle between approx. 12v and 8v, If OK go to Step 4. If NOT OK check for continuity between the switch and
control module on the low heat driver circuit, If OK replace the heated seat control module. If NOT OK, repair the
open or shorted circuit as required.
4. Back-probe the heated seat module wire harness connector, do not disconnect. Check cavity #11 for battery
voltage, while observing the voltmeter depress the right heated seat switch high setting twice, voltage should
toggle between approx.12v and 8v, If OK go to Step 5. If NOT OK check for continuity between the switch and
control module on the high heat driver circuit, If OK replace the heated seat control module. If NOT OK, repair
the open or shorted circuit as required.
5. Back-probe the heated seat module wire harness connector, do not disconnect. Check cavity #2 for approx. 5v,
voltage should be present, If OK go to Step 6. If NOT OK replace the heated seat control module.
6. Back-probe the heated seat module wire harness connector, do not disconnect. Check cavity #7 for a range in
voltage from 1.72v (warm seat) – 3.0v (cold seat). It should be within this range, If OK replace the heated seat
module. If NOT OK test the Heated Seat Sensor. If NOT OK, replace the right heated seat element and sensor
assembly. If the heated seat sensor tests OK, check for continuity between the right heated seat cushion con-
nector and control module connector on the 5v supply circuit, If NOT OK, repair the open or shorted 5v supply
circuit as required. If OK check for continuity between the right heated seat cushion connector and control mod-
ule connector on the temperature sensor input circuit. If NOT OK, repair the open or shorted temperature sensor
input circuit as required. If OK replace the heated seat control module.
LEFT SEAT HEATER INOPERATIVE
1. If a heated seat heats but one or both indicator lamps (LED’s) on the heated seat switch fail to illuminate, check
the driver circuit with the inoperative LED for a short to ground. If OK, replace the heated seat switch. If NOT OK
repair the short to ground as required and than replace the heated seat switch.
NOTE: IF THE LEFT SEAT CUSHION IS ALREADY WARM THE FOLLOWING STEP WILL NOT PROVE CON-
CLUSIVE.
8G - 26
HEATED SEATS - SERVICE INFORMATION
ND