DESCRIPTION
PTC HTR heater relays are closed in accordance with signals from the air conditioning amplifier assembly and power is supplied to the quick heater assembly installed on the radiator heater unit.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection 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) Check the operation by referring to the table below.
Air Conditioner
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
---|---|---|---|
Heater Active Level |
Quick heater assembly |
Min.: 0, Max.: 3 |
- |
OK:
Heater Active Level changes normally.
NG |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
2. |
INSPECT PTC HTR RELAY |
(a) Remove the PTC HTR relays.
(b) Inspect the PTC HTR relays (See page ).
NG |
REPLACE PTC HTR RELAY |
|
3. |
CHECK HARNESS AND CONNECTOR (PTC HTR RELAY - POWER SOURCE CIRCUIT) |
(a) Remove the PTC HTR relays.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
PTC HTR NO. 1
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 1-1 - Body ground |
Always |
11 to 14 V |
PTC HTR NO. 1-5 - Body ground |
Always |
11 to 14 V |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 2-1 - Body ground |
Always |
11 to 14 V |
PTC HTR NO. 2-5 - Body ground |
Always |
11 to 14 V |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 3-1 - Body ground |
Always |
11 to 14 V |
PTC HTR NO. 3-5 - Body ground |
Always |
11 to 14 V |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
CHECK HARNESS AND CONNECTOR (PTC HTR RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY) |
(a) Remove the PTC HTR relays.
(b) Disconnect the A14 air conditioning amplifier assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
PTC HTR NO. 1
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 1-2 - A14-15 (PTC1) |
Always |
Below 1 Ω |
PTC HTR NO. 1-2 or A14-15 (PTC1) - Body ground |
Always |
10 kΩ or higher |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 2-2 - A14-14 (PTC2) |
Always |
Below 1 Ω |
PTC HTR NO. 2-2 or A14-14 (PTC2) - Body ground |
Always |
10 kΩ or higher |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 3-2 - A14-13 (PTC3) |
Always |
Below 1 Ω |
PTC HTR NO. 3-2 or A14-13 (PTC3) - Body ground |
Always |
10 kΩ or higher |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. |
CHECK HARNESS AND CONNECTOR (QUICK HEATER ASSEMBLY - PTC HTR RELAY AND BODY GROUND) |
(a) Remove the PTC HTR relays.
(b) Disconnect the Q1 quick heater assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
PTC HTR NO. 1
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 1-3 - Q1-3 (B) |
Always |
Below 1 Ω |
Q1-2 (E) - Body ground |
Always |
Below 1 Ω |
Q1-4 (E) - Body ground |
Always |
Below 1 Ω |
PTC HTR NO. 1-3 or Q1-3 (B) - Body ground |
Always |
10 kΩ or higher |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 2-3 - Q1-1 (B) |
Always |
Below 1 Ω |
Q1-2 (E) - Body ground |
Always |
Below 1 Ω |
PTC HTR NO. 2-3 or Q1-1 (B) - Body ground |
Always |
10 kΩ or higher |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC HTR NO. 3-3 - Q1-5 (B) |
Always |
Below 1 Ω |
Q1-4 (E) - Body ground |
Always |
Below 1 Ω |
PTC HTR NO. 3-3 or Q1-5 (B) - Body ground |
Always |
10 kΩ or higher |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
6. |
INSPECT QUICK HEATER ASSEMBLY |
(a) Remove the quick heater assembly (See page ).
(b) Inspect the quick heater assembly (See page ).
OK |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
NG |
REPLACE QUICK HEATER ASSEMBLY |
Removal
REMOVAL
CAUTION / NOTICE / HINT
HINT:
Use the same procedure for the RH side and LH side.
The following procedure is for the LH side.
PROCEDURE
1. PRECAUTION
NOTICE:
After turning the ignition switch off, waiting time may be required before disconnecting
the cable from the ...
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
Use the following procedure to troubleshoot the sliding roof system.
*: Use the Techstream.
PROCEDURE
1.
VEHICLE BROUGHT TO WORKSHOP
NEXT
...
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of problem symptoms.
If multiple suspected areas are listed, the potential causes of the symptoms
are listed in order of probability in the "Suspected Area" column of the
table.
Check each ...