Toyota Tacoma (2015-2018) Service Manual: Mirror Heater does not Operate with Rear Defogger Switch
DESCRIPTION
When the mirror heater switch on the air conditioning control assembly is pressed, the operation signal is sent to the air conditioning amplifier assembly. When the air conditioning amplifier assembly receives the signal, it turns on a relay in the air conditioning amplifier assembly to operate the mirror heaters.
WIRING DIAGRAM
See page ( .gif)
).
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
|
1. |
PERFORM ACTIVE TEST USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.
(e) Perform the Active Test according to the display on the Techstream.
Air Conditioner|
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Defogger Relay (Rear) |
Mirror heater operation |
OFF or ON |
- |
|
Result |
Proceed to |
|---|---|
|
Mirror heater operation on both mirrors is not normal |
A |
|
Mirror heater operation on RH side mirror is not normal |
B |
|
Mirror heater operation on LH side mirror is not normal |
C |
| B | .gif) |
GO TO STEP 7 |
| C | |
GO TO STEP 9 |
|
.gif)
|
2. |
INSPECT MIR HTR RELAY |
|
(a) Remove the MIR HTR relay from the instrument panel relay block. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
3 - 5 |
Battery voltage applied to terminals 1 and 2 |
Below 1 Ω |
|
3 - 5 |
Battery voltage not applied between terminals |
10 kΩ or higher |
| NG | |
REPLACE MIR HTR RELAY |
|
|
3. |
CHECK HARNESS AND CONNECTOR (MIR HTR RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY) |
(a) for Automatic Air Conditioning
(1) Disconnect the A35 air conditioning amplifier assembly connector.
(2) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
MHR HTR relay terminal 1 - A35-9 (MHTR) |
Always |
Below 1 Ω |
|
MHR HTR relay terminal 1 or A35-9 (MHTR) - Body ground |
Always |
10 kΩ or higher |
(b) for Manual Air Conditioning
(1) Disconnect the A14 air conditioning amplifier assembly connector.
(2) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
MHR HTR relay terminal 1 - A14-17 (MHTR) |
Always |
Below 1 Ω |
|
MHR HTR relay terminal 1 or A14 -17 (MHTR) - Body ground |
Always |
10 kΩ or higher |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONING CONTROL ASSEMBLY) |
(a) for Automatic Air Conditioning
(1) Disconnect the A36 air conditioning amplifier assembly connector.
(2) Disconnect the A33 air conditioning control assembly connector.
(3) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A33-10(E) - A36-5 (RDSW) |
Always |
Below 1 Ω |
|
A33-10(E) or A36-5 (RDSW) - Body ground |
Always |
10 kΩ or higher |
(b) for Manual Air Conditioning
(1) Disconnect the A14 air conditioning amplifier assembly connector.
(2) Disconnect the A33 air conditioning control assembly connector.
(3) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A33-15(E) - A14-29 (RDSW) |
Always |
Below 1 Ω |
|
A33-15(E) or A14-29 (RDSW) - Body ground |
Always |
10 kΩ or higher |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
5. |
REPLACE AIR CONDITIONING CONTROL ASSEMBLY |
(a) Replace the air conditioning control assembly.
- for Automatic Air Conditioning (See page
)
- for Manual Air Conditioning (See page
)
|
|
6. |
CHECK MIRROR HEATER OPERATION |
(a) Check the mirror heater operation.
(See page )
| OK | |
END (AIR CONDITIONING CONTROL ASSEMBLY WAS DEFECTIVE) |
| NG | |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
|
7. |
CHECK HARNESS AND CONNECTOR (MIR HTR RELAY - OUTER REAR VIEW MIRROR ASSEMBLY RH - BODY GROUND) |
(a) Remove the MIR HTR relay from the instrument panel relay block.
(b) Disconnect the O3 outer rear view mirror assembly RH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
MIR HTR relay terminal 3 - O3-2 (+) |
Always |
Below 1 Ω |
|
O3-8 (-) - Body Ground |
Always |
Below 1 Ω |
|
MIR HTR relay terminal 3 or O3-2 (+) - Body Ground |
Always |
10 kΩ or higher |
|
Proceed to |
|---|
|
OK |
|
NG |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
8. |
INSPECT OUTER MIRROR COVER RH (MIRROR HEATER) |
(a) Remove the outer mirror RH.
(See page )
(b) Inspect the outer mirror RH.
(See page )
OK:
Outer mirror RH is normal.
Result|
Proceed to |
|---|
|
OK |
|
NG |
| OK | |
REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH |
| NG | |
REPLACE OUTER MIRROR RH |
|
9. |
CHECK HARNESS AND CONNECTOR (MIR HTR RELAY - OUTER REAR VIEW MIRROR ASSEMBLY LH - BODY GROUND) |
(a) Remove the MIR HTR relay from the instrument panel relay block.
(b) Disconnect the O2 outer rear view mirror assembly LH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
MIR HTR relay terminal 3 - O2-2 (+) |
Always |
Below 1 Ω |
|
O2-8 (-) - Body Ground |
Always |
Below 1 Ω |
|
MIR HTR relay terminal 3 or O2-2 (+) - Body Ground |
Always |
10 kΩ or higher |
|
Proceed to |
|---|
|
OK |
|
NG |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
10. |
INSPECT OUTER MIRROR COVER LH (MIRROR HEATER) |
(a) Remove the outer mirror LH.
(See page )
(b) Inspect the outer mirror LH.
(See page )
OK:
Outer mirror LH is normal.
Result|
Proceed to |
|---|
|
OK |
|
NG |
| OK | |
REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH |
| NG | |
REPLACE OUTER MIRROR LH |
Diagnosis System
DIAGNOSIS SYSTEM
1. CHECK DLC3
(a) Check the DLC3 (See page ).
2. INSPECT BATTERY VOLTAGE
(a) Measure the battery voltage.
Standard voltage:
11 to 14 V
If the voltage is below 11 V, recharge ...
Other System
...
Other materials:
Front Passenger Side Door ECU Communication Stop (B2322)
DESCRIPTION
This DTC is stored when LIN communication between the front power window regulator
motor assembly RH and main body ECU (multiplex network body ECU) stops for 10 seconds
or more.
DTC No.
DTC Detection Condition
Trouble Area
B2322
...
Vehicle Speed Sensor Circuit (C1AA3)
DESCRIPTION
The forward recognition camera receives vehicle speed signals from the skid control
ECU. If the skid control ECU receives a vehicle speed sensor malfunction signal,
it informs the forward recognition camera via CAN communication, and DTC C1AA3 is
stored.
DTC No.
...
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY (for Vehicle not Involved
in Collision)
(a) Perform a diagnostic system check (See page
).
(b) With the lower No. 1 instrument panel airbag assembly ...
