Jaguar X-Type Sedan and Estate (Wagon). Manual - part 498

1
2
3
4

1
2
3

Is the resistance greater than 10 ohms?
Yes

GO to A14

GO to A13

A10: CHECK THE AUXILIARY HEATER 1 CONTROL LINE 'OFF' STATE

• NOTE: It is assumed the ignition is still on from the previous step, if not, please make sure the ignition is returned to the 'key on engine
off' state.

Scan tool connected.
Access the ECM and control the auxiliary heater 1 relay PID.
De-activate the auxiliary heater 1.
Measure the resistance between:

Auxiliary heater 1 fuse connector

Vehicle battery

Auxiliary heater relay 1 output, pin 01

Positive post

Is the resistance greater than 10 ohms?
Yes

An intermittent fault may be present in the wiring harness. Visually check for
chaffed wires or other physical damage to the harness. If no fault is found in
the circuit, suspect the following component(s):- Fuse- ECM connector- Fusebox
assembly- ECM

GO to A11

A11: ELIMINATE THE ECM FROM THE POSSIBLE CAUSES

Key off.
ECM connector disconnected.
Key on, engine off.
Measure the resistance between:

Auxiliary heater 1 fuse connector

Vehicle battery

Auxiliary heater relay 1 output, pin 01

Negative post

Is the resistance greater than 10 ohms?
Yes

SUSPECT:- ECM

GO to A12

A12: CHECK THE ECM CONTROL LINE FOR SHORT CIRCUIT TO GROUND

Measure the resistance between:

ECM connector, harness side

Vehicle battery

Engine coolant heater relay 1 control, pin 61

Negative post

Is the resistance greater than 10 ohms?
Yes

SUSPECT:- Fusebox assembly

REPAIR the short circuit. For additional information, refer to the wiring
diagrams.

A13: CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE ECM HARNESS OR THE MODULE

Key off.
ECM connector disconnected.
Key on, engine off.
Measure the resistance between:

Junction box connector, harness side

Vehicle battery

Engine coolant heater relay 1 control, pin 38

Positive post

Is the resistance greater than 10 ohms?
Yes

SUSPECT:- ECM

REPAIR the short circuit. For additional information, refer to the wiring
diagrams.

A14: CHECK THE ECM CONTROL LINE FOR CONTINUITY

Key off.
ECM connector disconnected.
Measure the resistance between:

Junction box connector, harness side

ECM connector, harness side

Auxiliary heater relay 1 control, pin 38

Auxiliary heater relay 1 control, pin 61

Is the resistance less than 10 ohms?
Yes

SUSPECT:- ECM connector- ECM

REPAIR the open circuit, For additional information, refer to the wiring
diagrams.

PINPOINT TEST B : AUXILIARY HEATER RELAY 2

TEST CONDITIONS

DETAILS/RESULTS/ACTIONS

B1: CHECK THE AUXILIARY HEATER 2 CONTROL LINE 'ON' STATE

1
2
3
4
5
6
7

1
2
3
4

Auxiliary heater connector

Circuit

Pins

Auxiliary heater control

03/05

Auxiliary heater relay 2 connector

Circuit

Pin

Auxiliary heater relay 2 control

Ignition supply

Permanent 12 volt supply

Auxiliary heater 2 control

Engine control module connector

Circuit

Pin

Auxiliary heater relay 2 control

Key off.
Auxiliary heater connector disconnected.
Key on, engine off.
Scan tool connected.
Access the ECM and control the auxiliary heater relay 2 PID.
Activate the auxiliary heater 2.
Measure the voltage between:

Auxiliary heater connector, harness side

Vehicle battery

Auxiliary heater 2 control, pins 03 and 05

Negative post

Is the voltage between 9 volts and 15 volts?
Yes

GO to B7

GO to B2

B2: CHECK THE AUXILIARY HEATER 2 CONTROL LINE FOR SHORT CIRCUIT TO GROUND

Key off.
Auxiliary heater 2 relay connector disconnected.
Key on, engine off.
Measure the resistance between:

Auxiliary heater connector, harness side

Vehicle battery

Auxiliary heater 2 control, pins 03 and 05

Negative post

Is the resistance greater than 10 ohms?
Yes

GO to B3

REPAIR the short circuit. For additional information, refer to the wiring
diagrams.

B3: CHECK THE AUXILIARY HEATER 2 CONTROL LINE FOR CONTINUITY

Measure the resistance between:

Auxiliary heater connector, harness

side

Auxiliary heater 2 relay connector,

harness side

Auxiliary heater 2 control, pins 03 and
05

Auxiliary heater 2 control, pin 05

1
2

3
4

1
2
3
4

1
2

Is the resistance less than 10 ohms?
Yes

GO to B4

REPAIR the open circuit. For additional information, refer to the wiring
diagrams.

B4: CHECK THE SUPPLIES TO THE AUXILIARY HEATER 2 RELAY

Key off.
Measure the voltage between:

Auxiliary heater 2 relay connector, harness side

Vehicle battery

Permanent 12 volt supply, pin 03

Negative post

Key on, engine off.
Measure the voltage between:

Auxiliary heater 2 relay connector, harness side

Vehicle battery

Ignition supply, pin 01

Negative post

Are the voltages between 9 volts and 15 volts?
Yes

GO to B5

NO supply to the auxiliary heater 2 circuit. For additional information, refer to
the wiring diagrams.

B5: CHECK THE ECM CONTROL LINE 'ON' STATE

Scan tool connected.
Access the ECM and control the auxiliary heater relay 2 PID.
Activate the auxiliary heater 2.
Measure the resistance between:

Auxiliary heater 2 relay connector, harness side

Vehicle battery

Auxiliary heater relay 2 control, pin 02

Negative post

Is the resistance less than 10 ohms?
Yes

SUSPECT:- Auxiliary heater 2 relay connector- Auxiliary heater 2 relay

GO to B6

B6: CHECK THE ECM CONTROL LINE FOR SHORT CIRCUIT TO POWER

Measure the resistance between:

Auxiliary heater 2 relay connector, harness side

Vehicle battery

Auxiliary heater relay 2 control, pin 02

Positive post

Is the resistance greater than 10 ohms?
Yes

GO to B12

GO to B11

B7: CHECK THE AUXILIARY HEATER 2 CONTROL LINE 'OFF' STATE

• NOTE: It is assumed the ignition is still on from the previous step, if not, please make sure the ignition is returned to the 'key on engine
off' state.

Scan tool connected.
Access the ECM and control the auxiliary heater heater relay 2 PID.
De-activate the auxiliary heater 2.
Measure the resistance between:

Auxiliary heater connector, harness side

Vehicle battery

Auxiliary heater 2 control, pins 03 and 05

Positive post

Is the resistance greater than 10 ohms?
Yes

GO to B8

B8: CHECK THE AUXILIARY HEATER 2 CIRCUIT FOR SHORT CIRCUIT TO POWER IN THE HARNESS

Key off.
Auxiliary heater relay 2 connector disconnected.
Key on, engine off.
Measure the resistance between:

Auxiliary heater relay 2 connector, harness side

Vehicle battery

Auxiliary heater 2 control, pin 05

Positive post

Is the resistance greater than 10 ohms?
Yes

GO to B9

REPAIR the short circuit. For additional information, refer to the wiring
diagrams.

B9: CHECK THE ECM CONTROL LINE FOR SHORT CIRCUIT TO GROUND

Measure the resistance between:

Auxiliary heater relay 2 connector, harness side

Vehicle battery

Auxiliary heater 2 control, pin 02

Negative post

Is the resistance greater than 10 ohms?
Yes

SUSPECT:- Auxiliary heater relay 2

GO to B10

B10: CHECK WHETHER THE SHORT CIRCUIT TO GROUND IS IN THE ECM HARNESS OR THE MODULE

Key off.
ECM connector disconnected.

3
4

1
2
3
4

1
2
3

Key on, engine off.
Measure the resistance between:

Auxiliary heater relay 2 connector, harness side

Vehicle battery

Auxiliary heater 2 control, pin 02

Negative post

Is the resistance greater than 10 ohms?
Yes

SUSPECT:- ECM

REPAIR the short circuit. For additional information, refer to the wiring
diagrams.

B11: CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE ECM HARNESS OR THE MODULE

Key off.
ECM connector disconnected.
Key on, engine off.
Measure the resistance between:

Auxiliary heater relay 2 connector, harness side

Vehicle battery

Auxiliary heater 2 control, pin 02

Positive post

Is the resistance greater than 10 ohms?
Yes

SUSPECT:- ECM

REPAIR the short circuit. For additional information, refer to the wiring
diagrams.

B12: CHECK THE ECM CONTROL LINE FOR CONTINUITY

Key off.
ECM connector disconnected.
Measure the resistance between:

Auxiliary heater relay 2 connector, harness side

ECM connector, harness side

Auxiliary heater 2 control, pin 02

Auxiliary heater 2 control, pin 62

Is the resistance less than 10 ohms?
Yes

SUSPECT:- ECM connector- ECM

REPAIR the open circuit. For additional information, refer to the wiring
diagrams.

PINPOINT TEST C : AUXILIARY HEATER CIRCUIT TESTS

TEST CONDITIONS

DETAILS/RESULTS/ACTIONS

C1: CHECK THE AUXILIARY HEATER CIRCUITS FOR SHORT CIRCUIT TO POWER

Auxiliary heater fuse connector

Circuit

Pin

Auxiliary heater relay output

Auxiliary heater control

Engine control module

Circuit

Pin

Auxiliary heater control

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