DESCRIPTION
PTC 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
PROCEDURE
1. |
INSPECT PTC HEATER RELAY (PTC NO. 1, PTC NO. 2, PTC NO. 3) |
(a) Remove the PTC NO. 1 relay from the engine room No. 1 relay block, junction block. |
|
(b) Remove the PTC NO. 2 and PTC NO. 3 relays from the engine room No. 2 relay block.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
3 - 5 |
Battery voltage is not applied to terminals 1 and 2 |
10 kΩ or higher |
Battery voltage is applied to terminals 1 and 2 |
Below 1 Ω |
NG |
REPLACE PTC HEATER RELAY (PTC NO. 1, PTC NO. 2, PTC NO. 3) |
|
2. |
CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY |
(a) Remove the air conditioning amplifier assembly with its connectors still connected (See page ). |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F42-3 (PTC1) - Body ground |
|
Below 1 V* |
F42-22 (PTC2) - Body ground |
|
|
F42-4 (PTC3) - Body ground |
|
|
F42-3 (PTC1) - Body ground |
|
11 to 14 V* |
F42-22 (PTC2) - Body ground |
|
|
F42-4 (PTC3) - Body ground |
|
*a |
Component with harness connected (Air Conditioning Amplifier Assembly) |
HINT:
*: After the measurement conditions are met, wait 30 seconds before performing measurements.
NG |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
3. |
CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 1 RELAY BLOCK, JUNCTION BLOCK - AIR CONDITIONING AMPLIFIER) |
(a) Remove the PTC NO. 1 relay from the engine room No. 1 relay block, junction block.
(b) Disconnect the F42 amplifier connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC NO. 1 relay terminal 1 - F42-3 (PTC1) |
Always |
Below 1 Ω |
PTC NO. 1 relay terminal 1 - Body ground |
Always |
10 kΩ or higher |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 2 RELAY BLOCK - AIR CONDITIONING AMPLIFIER) |
(a) Remove the PTC NO. 2 and PTC NO. 3 relays from the engine room No. 2 relay block.
(b) Disconnect the F42 amplifier connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC NO. 2 relay terminal 1 - F42-22 (PTC2) |
Always |
Below 1 Ω |
PTC NO. 3 relay terminal 1 - F42-4 (PTC3) |
||
PTC NO. 2 relay terminal 1 - Body ground |
Always |
10 kΩ or higher |
PTC NO. 3 relay terminal 1 - Body ground |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. |
CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 1 RELAY BLOCK, JUNCTION BLOCK - QUICK HEATER) |
(a) Remove the PTC NO. 1 relay from the engine room No. 1 relay block, junction block.
(b) Disconnect the F85 heater connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC NO. 1 relay terminal 3 - F85-2 (B) |
Always |
Below 1 Ω |
PTC NO. 1 relay terminal 3 - Body ground |
Always |
10 kΩ or higher |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
6. |
CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 2 RELAY BLOCK - QUICK HEATER) |
(a) Remove the PTC NO. 2 and PTC NO. 3 relays from the engine room No. 2 relay block.
(b) Disconnect the F85 heater connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC NO. 2 relay terminal 3 - F85-3 (B) |
Always |
Below 1 Ω |
PTC NO. 3 relay terminal 3 - F85-1 (B) |
||
PTC NO. 2 relay terminal 3 - Body ground |
Always |
10 kΩ or higher |
PTC NO. 3 relay terminal 3 - Body ground |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
7. |
CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 1 RELAY BLOCK, JUNCTION BLOCK - BATTERY AND BODY GROUND) |
(a) Remove the PTC NO. 1 relay from the engine room No. 1 relay block, junction block. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC NO. 1 relay terminal 5 - Body ground |
Always |
11 to 14 V |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC NO. 1 relay terminal 2 - Body ground |
Always |
Below 1 Ω |
*1 |
PTC NO. 1 Relay |
*a |
Component without relay installed (Engine Room No. 1 Relay Block, Junction Block) |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
8. |
CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 2 RELAY BLOCK - BATTERY AND BODY GROUND) |
(a) Remove the PTC NO. 2 and PTC NO. 3 relays from the engine room No. 2 relay block. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC NO. 2 relay terminal 5 - Body ground |
Always |
11 to 14 V |
PTC NO. 3 relay terminal 5 - Body ground |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
PTC NO. 2 relay terminal 2 - Body ground |
Always |
Below 1 Ω |
PTC NO. 3 relay terminal 2 - Body ground |
*1 |
PTC NO. 2 Relay |
*2 |
PTC NO. 3 Relay |
*a |
Component without relay installed (Engine Room No. 2 Relay Block) |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
9. |
INSPECT QUICK HEATER ASSEMBLY |
(a) Remove the quick heater assembly (See page ). |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
1 (B) - 1 (E) |
Always |
Below 1 kΩ |
2 (B) - 1 (E) |
||
2 (B) - 2 (E) |
||
3 (B) - 2 (E) |
NG |
REPLACE QUICK HEATER ASSEMBLY |
|
10. |
CHECK HARNESS AND CONNECTOR (QUICK HEATER - BODY GROUND) |
(a) Disconnect the F86 heater connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F86-1 (E) - Body ground |
Always |
Below 1 Ω |
F86-2 (E) - Body ground |
*a |
Front view of wire harness connector (to Quick Heater Assembly) |
OK |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Inspection
INSPECTION
PROCEDURE
1. INSPECT SIDE AUTO STEP MOTOR ASSEMBLY
(a) Check that the motor gear rotates smoothly as follows.
NOTICE:
Do not apply positive (+) battery voltage to any terminals except terminal
5 and 4 to avoid damaging the pu ...
Parts Location
PARTS LOCATION
ILLUSTRATION
ILLUSTRATION
ILLUSTRATION
ILLUSTRATION
ILLUSTRATION
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