Htr Sub 30 Amper Toyota

E120466E04

(a) Remove the HTR SUB1 relay from the engine room R/B.

(b) Remove the HTR SUB2 and HTR SUB3 relays from the engine room R/B No. 2.

(c) Turn the ignition switch ON.

(d) When the PTC heater operating conditions are met (engine at idling speed or faster, ambient temperature is 10°C (50°F) or less, engine coolant temperature is 65°C (149°F) or less, and No. 3 heater control knob setting is MAX HOT), turn the blower switch to the Lo setting.

(e) Wait 30 seconds.

(f) Measure the voltage. Standard voltage.

Tester Connection

Specified Condition

HTR SUB1-2 - Body ground

11 to 14V

HTR SUB2-2 - Body ground

11 to 14V

HTR SUB3-2 - Body ground

11 to 14V

(g) Reinstall the HTR SUB1 relay.

(h) Reinstall the HTR SUB2 and HTR SUB3 relays.

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK HARNESS AND CONNECTOR (PTC HEATER RELAY - BODY GROUND)

Engine Room R/B:

HTR SUB1 Relay

X ?

II

-

[

5

3

]

HTR SUB3 Relay HTR SUB2 Relay

3

5

1X

(a) Remove the HTR SUB1 relay from the engine room R/B.

(b) Remove the HTR SUB2 and HTR SUB3 relays from the engine room R/B No. 2.

(c) Measure the resistance. Standard resistance

Tester Connection

Specified Condition

HTR SUB1-1 - Body ground

Below 1 Q

HTR SUB2-1 - Body ground

Below 1 Q

HTR SUB3-1 - Body ground

Below 1 Q

(d) Reinstall the HTR SUB1 relay.

(e) Reinstall the HTR SUB2 and HTR SUB3 relays.

REPAIR OR REPLAGE HARNESS OR GONNEGTOR

INSPECT PTC HEATER ASSEMBLY

Component Side:

PTC Heater Assembly Connnector

11 3 21

V

I , ' ' , 1

H

E115947E03

(a) Disconnect the A17 PTC heater assembly connector.

(b) Measure the resistance. Standard resistance

Tester Gonnection

Specified Condition

1 - 2

Below 1 Q

1 - 3

Below 1 Q

2 - 3

Below 1 Q

(c) Reconnect the PTC heater assembly connector.

REPLACE PTC HEATER ASSEMBLY

CHECK HARNESS AND CONNECTOR (BATTERY - PTC HEATER RELAY)

Engine Room R/B:

HTR SUB1 Relay

X ?

II

[

5

3

]

HTR SUB3 Relay HTR SUB2 Relay

3

5

1X

(a) Remove the HTR SUB1 relay from the engine room R/B.

(b) Remove the HTR SUB2 and HTR SUB3 relays from the engine room R/B No. 2.

(c) Measure the voltage. Standard voltage

Tester Connection

Condition

Specified Condition

HTR SUB1-5 - Body ground

Always

11 to 14V

HTR SUB2-5 - Body ground

Always

11 to 14 V

HTR SUB3-5 - Body ground

Always

11 to 14 V

(d) Reinstall the HTR SUB1 relay.

(e) Reinstall the HTR SUB2 and HTR SUB3 relays.

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK HARNESS AND CONNECTOR (PTC HEATER RELAY - PTC HEATER ASSEMBLY)

Engine Room R/B:

HTR SUB1 Relay

X ?

n

[

5

3

]

HTR SUB3 Relay HTR SUB2 Relay

3

5

I_

PTC Heater Assembly Connector s

L

1

2

3

Front View

(a) Remove the HTR SUB1 relay from the engine room R/B.

(b) Remove the HTR SUB2 and HTR SUB3 relays from the engine room R/B No. 2.

(c) Disconnect the A17 PTC heater assembly connector.

(d) Measure the resistance. Standard resistance

Tester Connection

Specified Condition

HTR SUB1-3 - A17-2 (B)

Below 1 Q

HTR SUB2-3 - A17-3 (B)

Below 1 Q

HTR SUB3-3 - A17-1 (B)

Below 1 Q

(e) Reinstall the HTR SUB1 relay.

(f) Reinstall the HTR SUB2 and HTR SUB3 relays.

(g) Reconnect the PTC heater assembly connector.

nGj>

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE AIR CONDITIONING AMPLIFIER

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