Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSJAGUAR2005XJ8 BASEREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESMODULE COMMUNICATIONS NETWORK (2003.5-09)
2005 Jaguar XJ8 Base
Module Communications Network (2003.5-09)
2005 Jaguar XJ8 BaseSECTION Module Communications Network (2003.5-09)
- Description and Operation
- Diagnosis and Testing
- Communications Network
- Pinpoint Tests
- PINPOINT TEST G239843p1: CHECK THE CONTROLLER AREA NETWORK FOR OPEN CIRCUIT
- G239843t1: CHECK THE CAN NETWORK FOR CONTINUITY
- G239843t2: CHECK THE REAR CLIMATE CONTROL MODULE (RCCM) CAN + CIRCUIT FOR CONTINUITY
- G239843t3: CHECK THE REAR CLIMATE CONTROL MODULE (RCCM) CAN - CIRCUIT FOR CONTINUITY
- G239843t4: CHECK THE YAW RATE SENSOR CAN + CIRCUIT FOR CONTINUITY
- G239843t5: CHECK THE YAW RATE SENSOR CAN - CIRCUIT FOR CONTINUITY
- G239843t6: CHECK THE ASCCM CAN + CIRCUIT FOR CONTINUITY
- G239843t7: CHECK THE ASCCM CAN - CIRCUIT FOR CONTINUITY
- G239843t8: CHECK THE TCM CAN + CIRCUIT FOR CONTINUITY
- G239843t9: CHECK THE TCM CAN - CIRCUIT FOR CONTINUITY
- G239843t10: CHECK THE CAN + CIRCUIT BETWEEN THE DLC AND THE INSTRUMENT CLUSTER (IC) FOR CONTINUITY
- G239843t11: CHECK THE CAN - CIRCUIT BETWEEN THE DLC AND THE INSTRUMENT CLUSTER (IC) FOR CONTINUITY
- G239843t12: CHECK THE CAN + CIRCUIT BETWEEN THE INSTRUMENT CLUSTER (IC) AND THE AIR SUSPENSION MODULE (ASU) FOR CONTINUITY
- G239843t13: CHECK THE CAN - CIRCUIT BETWEEN THE INSTRUMENT CLUSTER (IC) AND THE AIR SUSPENSION MODULE (ASU) FOR CONTINUITY
- G239843t14: CHECK THE CAN + CIRCUIT BETWEEN THE INSTRUMENT CLUSTER (IC) AND THE J-GATE MODULE (JGM) FOR CONTINUITY
- G239843t15: CHECK THE CAN - CIRCUIT BETWEEN THE INSTRUMENT CLUSTER (IC) AND THE J-GATE MODULE (JGM) FOR CONTINUITY
- G239843t16: CHECK THE CAN + CIRCUIT BETWEEN THE J-GATE MODULE (JGM) AND THE AIR CONDITIONING MODULE (A/CCM) FOR CONTINUITY
- G239843t17: CHECK THE CAN - CIRCUIT BETWEEN THE J-GATE MODULE (JGM) AND THE AIR CONDITIONING MODULE (A/CCM) FOR CONTINUITY
- G239843t18: CHECK THE CAN + CIRCUIT BETWEEN THE AIR CONDITIONING MODULE (A/CCM) AND THE ABS CONTROL MODULE (ABSCM) FOR CONTINUITY
- G239843t19: CHECK THE CAN - CIRCUIT BETWEEN THE AIR CONDITIONING MODULE (A/CCM) AND THE ABS CONTROL MODULE (ABSCM) FOR CONTINUITY
- G239843t20: CHECK THE CAN + CIRCUIT BETWEEN THE ABS CONTROL MODULE (ABSCM) AND THE ENGINE CONTROL MODULE (ECM) FOR CONTINUITY
- G239843t21: CHECK THE CAN - CIRCUIT BETWEEN THE ABS CONTROL MODULE (ABSCM) AND THE ENGINE CONTROL MODULE (ECM) FOR CONTINUITY
- PINPOINT TEST G239843p2: CHECK THE CONTROLLER AREA NETWORK FOR SHORT CIRCUIT
- G239843t22: CHECK THE CAN + FOR SHORT CIRCUIT TO B +
- G239843t23: CHECK THE CAN + FOR SHORT CIRCUIT TO IGNITION SWITCHED +
- G239843t24: CHECK THE CAN + FOR SHORT CIRCUIT TO GROUND
- G239843t25: CHECK THE CAN - FOR SHORT CIRCUIT TO B +
- G239843t26: CHECK THE CAN - FOR SHORT CIRCUIT TO IGNITION SWITCHED +
- G239843t27: CHECK THE CAN - FOR SHORT CIRCUIT TO GROUND
- PINPOINT TEST G239843p3: CHECK THE SCP NETWORK
- G239843t28: CHECK FOR CORRECT BUS TERMINATION IN THE SCP + NETWORK
- G239843t29: CHECK THE SCP + FOR SHORT CIRCUIT TO BATTERY
- G239843t30: CHECK THE SCP + FOR SHORT CIRCUIT TO IGNITION +
- G239843t31: CHECK THE SCP + FOR SHORT CIRCUIT TO GROUND
- G239843t32: CHECK THE SCP - FOR SHORT CIRCUIT TO BATTERY
- G239843t33: CHECK THE SCP - FOR SHORT CIRCUIT TO IGNITION +
- G239843t34: CHECK THE SCP - FOR SHORT CIRCUIT TO GROUND
- G239843t35: CHECK FOR SHORT CIRCUIT BETWEEN SCP + AND SCP -
- PINPOINT TEST G239843p4: CHECK THE ISO NETWORK CIRCUIT
- G239843t36: CHECK THE TCM ISO CIRCUIT FOR SHORT TO BATTERY +
- G239843t37: CHECK THE TCM ISO CIRCUIT FOR SHORT TO IGNITION +
- G239843t38: CHECK THE TCM ISO CIRCUIT FOR SHORT TO GROUND
- G239843t39: CHECK THE TCM ISO CIRCUIT FOR HIGH RESISTANCE
- G239843t40: CHECK THE ISO CIRCUIT FOR SHORT TO BATTERY +
- G239843t41: CHECK THE ISO CIRCUIT FOR SHORT TO IGNITION +
- G239843t42: CHECK THE ISO CIRCUIT FOR SHORT TO GROUND
- G239843t43: CHECK THE ISO CIRCUIT BETWEEN THE RIGHT-HAND HID AND THE DLC FOR HIGH RESISTANCE
- G239843t44: CHECK THE ISO CIRCUIT BETWEEN THE LEFT-HAND HID AND THE DLC FOR HIGH RESISTANCE
- G239843t45: CHECK THE ISO CIRCUIT BETWEEN THE ECM AND THE DLC FOR HIGH RESISTANCE
- G239843t46: CHECK THE ISO CIRCUIT BETWEEN THE PARKING AID MODULE AND THE DLC FOR HIGH RESISTANCE
- G239843t47: CHECK THE ISO CIRCUIT BETWEEN THE INTRUSION SENSOR AND THE DLC FOR HIGH RESISTANCE
- G239843t48: CHECK THE ISO CIRCUIT BETWEEN THE AIRBAG MODULE AND THE DLC FOR HIGH RESISTANCE
- PINPOINT TEST G239843p5: ONE OR MORE D2B MODULES NOT RESPONDING. WAKE-UP SIGNAL FAULT
- G239843t255: CHECK THE WAKE-UP SIGNAL TO THE CD CHANGER
- G239843t256: CHECK THE WAKE-UP SIGNAL TO THE PHONE MODULE
- G239843t257: CHECK THE WAKE-UP SIGNAL TO THE VOICE ACTIVATED CONTROL MODULE
- G239843t258: CHECK THE WAKE-UP SIGNAL TO THE NAVIGATION COMPUTER
- G239843t259: CHECK THE WAKE-UP SIGNAL TO THE AMP
- G239843t351: CHECK THE WAKE-UP SIGNAL TO THE REAR ENTERTAINMENT MODULE
- PINPOINT TEST G239843p24: U2003; COMPACT DISC CHANGER NOT RESPONDING
- PINPOINT TEST G239843p25: U2008; PHONE MODULE NOT RESPONDING
- PINPOINT TEST G239843p26: U2019; VOICE ACTIVATED CONTROL MODULE (VACM) NOT RESPONDING
- PINPOINT TEST G239843p27: U2613; NAVIGATION CONTROL MODULE NOT RESPONDING
- PINPOINT TEST G239843p28: U2614; AMPLIFIER NOT RESPONDING
- PINPOINT TEST G239843p43: U2615; REAR ENTERTAINMENT MODULE NOT RESPONDING
- PINPOINT TEST G239843p29: U2602: BREAK IN OPTICAL HARNESS FROM AUDIO CONTROL MODULE. (TRANSMITTER)
- G239843t243: CHECK FIBRE OPTIC LEAD BETWEEN LUGGAGE COMPARTMENT JOINT AND CD CHANGER
- G239843t244: CHECK CABIN FIBRE OPTIC HARNESS
- G239843t245: CHECK FIBRE OPTIC LEAD BETWEEN ASHTRAY AND AUDIO CONTROL MODULE
- G239843t246: CHECK THE AUDIO CONTROL MODULE
- G239843t247: CHECK THE FIBRE OPTIC LEAD FROM THE CD CHANGER TO THE PHONE MODULE
- G239843t248: CHECK THE FIBRE OPTIC LEAD FROM THE PHONE MODULE TO THE VOICE MODULE
- G239843t354: CHECK THE FIBRE OPTIC LEAD FROM THE VOICE MODULE TO THE REAR ENTERTAINMENT MODULE
- G239843t355: CHECK THE FIBRE OPTIC LEAD FROM THE REAR ENTERTAINMENT MODULE TO THE NAVIGATION COMPUTER
- G239843t249: CHECK THE FIBRE OPTIC LEAD FROM THE VOICE MODULE TO THE NAVIGATION COMPUTER
- G239843t250: CHECK THE FIBRE OPTIC LEAD FROM THE NAVIGATION COMPUTER TO THE AMP
- PINPOINT TEST G239843p30: U2603: BREAK IN OPTICAL HARNESS TO AUDIO CONTROL MODULE. (RECEIVER)
- PINPOINT TEST G239843p6: CHECK THE SUPPLIES AND GROUNDS TO THE CD CHANGER
- PINPOINT TEST G239843p7: CHECK THE SUPPLIES AND GROUNDS TO THE AMPLIFIER
- PINPOINT TEST G239843p8: CHECK THE SUPPLIES AND GROUNDS TO THE CELLULAR PHONE MODULE
- PINPOINT TEST G239843p9: CHECK THE SUPPLIES AND GROUNDS TO THE VOICE CONTROL MODULE
- PINPOINT TEST G239843p10: CHECK THE SUPPLIES AND GROUNDS TO THE REAR ENTERTAINMENT CONTROL PANEL
- PINPOINT TEST G239843p11: CHECK THE SUPPLIES AND GROUNDS TO THE NAVIGATION SYSTEM MODULE
- PINPOINT TEST G239843p12: CHECK THE SUPPLIES AND GROUNDS TO THE ICE HEAD UNIT
- PINPOINT TEST G239843p13: CHECK THE SUPPLIES AND GROUNDS TO THE FRONT ELECTRONIC MODULE
- PINPOINT TEST G239843p14: CHECK THE SUPPLIES AND GROUNDS TO THE REAR ELECTRONIC MODULE
- PINPOINT TEST G239843p15: CHECK THE SUPPLIES AND GROUNDS TO THE REAR MEMORY MODULE (RMM)
- PINPOINT TEST G239843p16: CHECK THE SUPPLIES AND GROUNDS TO THE ELECTRONIC PARK BRAKE MODULE (EPB)
- PINPOINT TEST G239843p17: CHECK THE SUPPLIES AND GROUNDS TO THE DRIVER DOOR CONTROL MODULE (DDCM)
- PINPOINT TEST G239843p18: CHECK THE SUPPLIES AND GROUNDS TO THE DRIVER SEAT CONTROL MODULE (DSCM)
- PINPOINT TEST G239843p19: CHECK THE SUPPLIES AND GROUNDS TO THE ENGINE CONTROL MODULE (ECM)
- PINPOINT TEST G239843p20: CHECK THE SUPPLIES AND GROUNDS TO THE PARKING AID CONTROL MODULE (PACM)
- PINPOINT TEST G239843p21: CHECK THE SUPPLIES AND GROUNDS TO THE INTRUSION SENSOR
- PINPOINT TEST G239843p22: CHECK THE SUPPLIES AND GROUNDS TO THE RESTRAINTS CONTROL MODULE (RCM)
- PINPOINT TEST G239843p23: CHECK THE SUPPLIES AND GROUNDS TO THE INSTRUMENT CLUSTER (IC)
- PINPOINT TEST G239843p31: CHECK THE SUPPLIES AND GROUNDS TO THE J-GATE MODULE (JGM)
- PINPOINT TEST G239843p32: CHECK THE SUPPLIES AND GROUNDS TO THE AIR CONDITIONING CONTROL MODULE (A/CCM)
- PINPOINT TEST G239843p33: CHECK THE SUPPLIES AND GROUNDS TO THE DYNAMIC STABILITY CONTROL MODULE (DSCCM)
- PINPOINT TEST G239843p34: CHECK THE SUPPLIES AND GROUNDS TO THE TRANSMISSION CONTROL MODULE (TCM)
- PINPOINT TEST G239843p35: CHECK THE SUPPLIES AND GROUNDS TO THE ADAPTIVE SPEED CONTROL MODULE (ASCCM)
- PINPOINT TEST G239843p36: CHECK THE SUPPLIES AND GROUNDS TO THE AIR SUSPENSION CONTROL MODULE (ASU)
- PINPOINT TEST G239843p37: U2022; CONTROL PANEL COMMUNICATIONS ERROR
- G239843t117: CHECK THE CONTROL PANEL CLOCK CIRCUIT FOR HIGH RESISTANCE
- G239843t118: CHECK THE CONTROL PANEL CLOCK CIRCUIT FOR SHORT TO GROUND
- G239843t119: CHECK THE CONTROL PANEL CLOCK CIRCUIT FOR SHORT TO B+
- G239843t120: CHECK THE CONTROL PANEL DATA CIRCUIT FOR HIGH RESISTANCE
- G239843t121: CHECK THE CONTROL PANEL DATA CIRCUIT FOR SHORT TO GROUND
- G239843t122: CHECK THE CONTROL PANEL DATA CIRCUIT FOR SHORT TO B+
- PINPOINT TEST G239843p1: CHECK THE CONTROLLER AREA NETWORK FOR OPEN CIRCUIT
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.